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mongodb多实例安装及replica set配置

　　需求：为了容灾，需要部署两台服务器，便于主备切换，当主服务器挂掉之后，主辅服务器角色永远对换，即使之前主服务器恢复也不再重新恢复之前主辅角色，直到下次发生主备切换

       分析：mongodb 两种数据复制方式：1、主备，当主服务器挂掉之后，辅服务器不能够提供写服务，故 mongodb 主备方案不合适。2、replica set，但只有两个节点时，主节点挂掉，辅节点也不能提供写服务，与主备效果一样，所以至少需要三个 mongodb 实例，但当前只有两台服务器，所以有一台服务器要安装有两个 mongodb 实例，一台机器上不需要两份数据拷贝，故第三个节点使用 arbiter，只进行投票，不会被选为主节点，也不会拷贝数据。另外考虑到需求中主备逻辑，结合 replica set 特点，arbiter 只能在服务器中运行，考虑到主备角色调换，故两台服务器每台需要安装两个 mongodb 实例，其中一个为 arbiter

　　两台服务器：

　　192.168.103.5     （原始主服务器）

　　192.168.103.28   （原始辅服务器）

一、两台服务器分别安装 mongodb

安装步骤可参考：https://www.cnblogs.com/qq931399960/p/10425803.html

二、两台服务器分别安装 arbiter

1、新建 mongodb 日志和数据库存储路径

mkdir -p /home/mongo-arbiter/db
mkdir -p /home/mongo-arbiter/log

2、拷贝配置文件

cp /etc/mongod.conf /etc/mongod-arbiter.conf

3、修改配置文件

vim /etc/mongod-arbiter.conf

systemLog.path修改为/home/mongo-arbiter/log/mongod.log

Storage.dbPath修改为/home/mongo-arbiter/db

processManagement.pidFilePath修改为/var/run/mongodb/mongod-arbiter.pid

net.port修改为27018

4、修改权限

chown -R mongod:mongod /home/mongo-arbiter

5、设置 arbiter 开机启动

cp /usr/lib/systemd/system/mongod.service /usr/lib/systemd/system/mongod-arbiter.service

修改开机启动文件

vim /usr/lib/systemd/system/mongod-arbiter.service

Environment改为："OPTIONS=-f /home/mongo-arbiter/mongod.conf"

PIDFile改为：/var/run/mongodb/mongod-arbiter.pid

使配置生效

systemctl enable mongod-arbiter.service
systemctl daemon-reload

初始化用户（四个实例的用户要一致）

 cat ./mongdb/initUser.js | mongo --port 27018 --shell

6、登录检测

mongo  -uroot -pabc123 --authenticationDatabase "admin" --port 27018

正常登陆，ok

三、配置 replica set

1、停止所有 mongodb 实例

2、生成 keyfile 文件

openssl rand -base64 756 > /home/replSetKey
chmod 400 /home/replSetKey
chown -R mongod:mongod /home/replSetKey

2、将上述文件拷贝到另外一台服务器 /home 下（路径可自定义，只要四个实例使用相同 kefile 文件即可）

3、添加 / 修改 mongodb 实例配置（如下配置每个实例相同，4 个 mongodb 实例都需要修改，如下列出的只有新加和修改的，不变的未列出）

security:
  keyFile: /home/replSetKey      ##  新加
replication:
  replSetName: mongoSet         ##  新加
net:
  bindIp: 0.0.0.0   ## 修改

4、启动主服务器默认 27017 端口 mongodb 实例，启动辅服务器中两个 mongodb 实例

systemctl start mongod
systemctl start mongod-arbiter

5、查看防火墙是否关闭，或者 27017 和 27018 端口是否放开

未关闭防火墙或者以上端口不能访问，则初始化 replica set 失败

关闭防火墙命令

systemctl stop firewalld
systemctl disable firewalld

6、在主服务器（103.5）进入 mongodb 命令

mongo -u "root" -p "abc123" --authenticationDatabase "admin"

7、初始化两个 memeber 的 replicat set

config = {_id:"mongoSet", members:[{_id:0,host:"192.168.103.5:27017",priority:2},
　　　　　　　　　　　　　　　　　　{_id:1,host:"192.168.103.28:27017",priority:1}]}
rs.initiate(config, true)

此时可通过 rs.status() 状态

8、添加 arbiter 仲裁节点

rs.addArb("192.168.103.28:27018")

rs.status()查看各节点状态，如果有节点 stateStr 显示 not reachable/healthy，health 显示为 0，则重启该节点，再次通过 rs.status() 查看是否正常

到此，主备服务基本配置结束

java 客户端连接地址为：

mongodb://root:abc123@192.168.103.5:27017,192.168.103.28:27017/?authSource=mydb&replicaSet=mongoSet

四、重新配置 replica set

当主备服务器切换，java 客户端连接由于配置了 replicaSet，可以自动去新主节点进行业务处理，不会有问题，当主设备恢复为后，原主服务器 mongodb 再次成为了主节点，但其他服务已经在新主服务器上

A、mongodb 和 web 服务不在台机器，中间有网络传输，影响性能

B、此时的 replica set 中，主节点在辅服务器上，主服务器上只有辅节点和 arbiter，当主服务器挂掉，只有一个 mongodb 节点，不能在提供写服务

综上两点，尤其是第二点，需要重新配置 replica set，登录到 mongodb 主节点

mongo  -uroot -pabc123 --authenticationDatabase "admin"

或者在主服务器远程登录恢复的 mongodb 主节点

mongo -u "root" -p "abc123" --authenticationDatabase "admin" --host 192.168.103.5

重新配置

reconfig = {_id:"mongoSet","protocolVersion" : 1, members:[{_id:0,host:"192.168.103.5:27017",priority:1},
　　　　　　　　　　　　　　　　　　{_id:1,host:"192.168.103.28:27017",priority:2}]}

rs.reconfig(reconfig, true)

添加 arbiter 节点

rs.addArb("192.168.103.5:27018")

使用 rs.status()查看状态，如果有节点 stateStr 显示 not reachable/healthy，health 显示为 0，则重启该节点，再次通过 rs.status() 查看是否正常

 

PS：

1、若有节点 stateStr 出现 not reachable/healthy，health 显示为 0，则该节点可能是 arbiter 节点，官方不推荐将 arbiter 节点安装到存在 primary 和 slave 节点的服务器上，不过当前只有两台服务器，也只有这样了，可以正常运行。

2、重新配置时，需要保证之前已存在的 host 的 id 是相同的

3、重新配置需要添加 protocolVersion

 

五、使用脚本简化操作

1、提前准备好配置文件和 arbiter 开机启动 service 文件，需要的字段都添加上, 但 replica set 相关字段为注释状态，因为打开后，所有节点都将无法进行写操作，新建用户后打开，并重启 mongodb

2、提前准备好 kefile，两台服务器都使用该文件

3、安装 mongodb (数据库和日志路径可以自定义)

#!/bin/bash
basedir=$(cd "$(dirname "$0")";pwd)
function initenv(){
  setenforce 0
  sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
}
########inst mongdb 4.0#############
function inst(){
  cp -f ./mongdb/mongod.conf /etc/
  rpm -ivh ./mongdb/*rpm
  cd /home
  mkdir -p mongo-db
  mkdir -p mongo-log
  chown -R mongod:mongod ./mongo-db
  chown -R mongod:mongod ./mongo-log

systemctl enable mongod
systemctl start mongod
}
function initdb(){
cd $basedir
cat ./mongdb/initUser.js | mongo --shell
cat ./mongdb/initIndex.js | mongo -u "root" -p "abc123" --authenticationDatabase "admin"
}


function cpReplicaSetKey(){
cd $basedir
cp ./mongdb/replSetKey /home/
chmod 400 /home/replSetKey
chown -R mongod:mongod /home/replSetKey
}


function openReplicaSet(){
sed -i 's/#keyFile/keyFile/g' /etc/mongod.conf
sed -i 's/#replication/replication/g' /etc/mongod.conf
sed -i 's/#replSetName/replSetName/g' /etc/mongod.conf
}


function stopMongo(){
systemctl stop mongod
}
function startMongo(){
systemctl start mongod
}


function main(){
initenv
inst
initdb
stopMongo
cpReplicaSetKey
openReplicaSet
startMongo
}


main | tee -a ./log/inst_mongodb.log

View Code

4、安装 mongodb arbiter 节点（在 rs.addArb() 之前其实还不能说是 arbiter 节点，只是起了个名字叫 arbiter 节点）

#!/bin/bash
basedir=$(cd "$(dirname "$0")";pwd)
function initenv(){
  setenforce 0
  sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
}
########inst mongdb 4.0#############
function inst(){
  cp -f ./mongdb/mongod-arbiter.conf /etc/
  cp -f ./mongdb/mongod-arbiter.service /usr/lib/systemd/system/

mkdir -p /home/mongodb-arbiter/log
mkdir -p /home/mongodb-arbiter/db
chown -R mongod:mongod /home/mongodb-arbiter


systemctl enable mongod-arbiter
systemctl start mongod-arbiter
}
function initdb(){
cd $basedir
cat ./mongdb/initUser.js | mongo --port 27018 --shell
cat ./mongdb/initIndex.js | mongo --port 27018 -u "root" -p "abc123" --authenticationDatabase "admin"
}


function openReplicaSet(){
sed -i 's/#keyFile/keyFile/g' /etc/mongod-arbiter.conf
sed -i 's/#replication/replication/g' /etc/mongod-arbiter.conf
sed -i 's/#replSetName/replSetName/g' /etc/mongod-arbiter.conf
}


function stopMongo(){
systemctl stop mongod
}
function startMongo(){
systemctl start mongod
}


function main(){
initenv
inst
initdb
stopMongo
openReplicaSet
startMongo
}


main | tee -a ./log/inst_mongodb_arbiter.log

View Code

5、初始 replica set

#!/bin/bash
basedir=$(cd "$(dirname "$0")";pwd)

source ./app.properties


nowtime=<span style="color: rgba(0, 0, 255, 1)">date</span> --<span style="color: rgba(0, 0, 255, 1)">date</span>=<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">0 days ago</span><span style="color: rgba(128, 0, 0, 1)">'</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">+%Y%m%d%H%M%S</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
daytime=<span style="color: rgba(0, 0, 255, 1)">date</span> --<span style="color: rgba(0, 0, 255, 1)">date</span>=<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">0 days ago</span><span style="color: rgba(128, 0, 0, 1)">'</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">+%Y%m%d</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">


logPath=./log/init_repliaset_$daytime.log
function log(){
echo $1 | tee -a $logPath
}


function logfile(){
echo $1 >> $logPath
}


function testConfig(){
log "check relate config."
if [ "$masterServerIp" == "masterIp" ];then
log "ERROR: masterServerIp is not correct in the file app.properties"
exit 1
fi


<span style="color: rgba(0, 0, 255, 1)">if</span> [ <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">$slaveServerIp</span><span style="color: rgba(128, 0, 0, 1)">"</span> == <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">slaveIp</span><span style="color: rgba(128, 0, 0, 1)">"</span> ];<span style="color: rgba(0, 0, 255, 1)">then</span><span style="color: rgba(0, 0, 0, 1)">
    log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">ERROR: slaveServerIp is not correct in the file app.properties</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
    exit </span><span style="color: rgba(128, 0, 128, 1)">1</span>
<span style="color: rgba(0, 0, 255, 1)">fi</span><span style="color: rgba(0, 0, 0, 1)">

local grepIp</span>=`<span style="color: rgba(0, 0, 255, 1)">ifconfig</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span><span style="color: rgba(0, 0, 0, 1)"> $masterServerIp`

## it is must execute </span><span style="color: rgba(0, 0, 255, 1)">in</span> the master server <span style="color: rgba(0, 0, 255, 1)">which</span> you input <span style="color: rgba(0, 0, 255, 1)">in</span> the app.properties <span style="color: rgba(0, 0, 255, 1)">file</span><span style="color: rgba(0, 0, 0, 1)"> when first initiate ths replica set
</span><span style="color: rgba(0, 0, 255, 1)">if</span> [ <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">$grepIp</span><span style="color: rgba(128, 0, 0, 1)">"</span> == <span style="color: rgba(128, 0, 0, 1)">""</span> ];<span style="color: rgba(0, 0, 255, 1)">then</span><span style="color: rgba(0, 0, 0, 1)">
    log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">the current server is not the master server,  please login on to $masterServerIp and execute this script.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
    exit </span><span style="color: rgba(128, 0, 128, 1)">1</span>
<span style="color: rgba(0, 0, 255, 1)">fi</span><span style="color: rgba(0, 0, 0, 1)">

## test the connection
</span><span style="color: rgba(0, 0, 255, 1)">echo</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">use admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;<span style="color: rgba(0, 0, 0, 1)"> test.js
</span><span style="color: rgba(0, 0, 255, 1)">echo</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.slaveOk()</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;&gt;<span style="color: rgba(0, 0, 0, 1)"> test.js
</span><span style="color: rgba(0, 0, 255, 1)">echo</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">show dbs</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;&gt;<span style="color: rgba(0, 0, 0, 1)"> test.js

</span><span style="color: rgba(0, 0, 255, 1)">cat</span> test.js | mongo --host $slaveServerIp -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;&gt;<span style="color: rgba(0, 0, 0, 1)"> $logPath

</span><span style="color: rgba(0, 0, 255, 1)">if</span> [ $? != <span style="color: rgba(128, 0, 128, 1)">0</span> ];<span style="color: rgba(0, 0, 255, 1)">then</span><span style="color: rgba(0, 0, 0, 1)">
        log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">mongodb instance which port is 27017 in $slaveServerIp server can not connect.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
        exit </span><span style="color: rgba(128, 0, 128, 1)">1</span><span style="color: rgba(0, 0, 0, 1)">;
</span><span style="color: rgba(0, 0, 255, 1)">fi</span>

<span style="color: rgba(0, 0, 255, 1)">cat</span> test.js | mongo --host $slaveServerIp --port <span style="color: rgba(128, 0, 128, 1)">27018</span> -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;&gt;<span style="color: rgba(0, 0, 0, 1)"> $logPath

</span><span style="color: rgba(0, 0, 255, 1)">if</span> [ $? != <span style="color: rgba(128, 0, 128, 1)">0</span> ];<span style="color: rgba(0, 0, 255, 1)">then</span><span style="color: rgba(0, 0, 0, 1)">
        log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">mongodb instance which port is 27018 in $slaveServerIp server can not connect.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
        exit </span><span style="color: rgba(128, 0, 128, 1)">1</span><span style="color: rgba(0, 0, 0, 1)">;
</span><span style="color: rgba(0, 0, 255, 1)">fi</span>

<span style="color: rgba(0, 0, 255, 1)">cat</span> test.js | mongo --host $masterServerIp -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;&gt;<span style="color: rgba(0, 0, 0, 1)"> $logPath

</span><span style="color: rgba(0, 0, 255, 1)">if</span> [ $? != <span style="color: rgba(128, 0, 128, 1)">0</span> ];<span style="color: rgba(0, 0, 255, 1)">then</span><span style="color: rgba(0, 0, 0, 1)">
        log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">mongodb instance which port is 27017 in $slaveServerIp server can not connect.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
        exit </span><span style="color: rgba(128, 0, 128, 1)">1</span><span style="color: rgba(0, 0, 0, 1)">;
</span><span style="color: rgba(0, 0, 255, 1)">fi</span>

<span style="color: rgba(0, 0, 255, 1)">rm</span> -<span style="color: rgba(0, 0, 0, 1)">rf test.js
log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">check relate config end.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">



}


function initTwoMemberReplicaSet(){
log "init two member replica set."
echo "use admin" > init.js
echo "config = {_id:"mongoSet", members:[{_id:0,host:"$masterServerIp:27017",priority:2},{_id:1,host:"$slaveServerIp:27017",priority:1}]}" >> init.js
echo "rs.initiate(config, {force:true})" >> init.js
cat init.js | mongo -uroot -pabc123 --authenticationDatabase "admin" >> $logPath
## sleep 3 second for primary election.
sleep 3s
log "init two member replica set end."
}


function isElectPrimary(){
log "check is the master node selected."
local masterStr=mongo -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">PRIMARY</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">name</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span><span style="color: rgba(0, 0, 0, 1)"> $masterServerIp
local count=0
while [[ "$masterStr" == "" ]];do
sleep 1s
count=$((count+1))
masterStr=mongo -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">PRIMARY</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">name</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span><span style="color: rgba(0, 0, 0, 1)"> $masterServerIp
if [ "$masterStr" != "" ];then
log "the master node is selected."
break
fi
if [ "$count" == "30" ];then
log "ERROR: arbiter configure timeout, please configure manually with 'rs.addArb("$slaveServerIp:27018")' in $masterServerIp:27017"
exit 1
fi
done
log "check is the master node selected end."
}


function addArbiter(){
log "add arbiter ..."
mongo  -uroot -pabc123 --authenticationDatabase "admin" --eval "rs.addArb("$slaveServerIp:27018")"
log "add arbiter end."
}


function chekArbiter(){
log "check arbiter."
local arbiterStr=mongo -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">$slaveServerIp:27018</span><span style="color: rgba(128, 0, 0, 1)">"</span> -A <span style="color: rgba(128, 0, 128, 1)">3</span>| <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
if [ "$arbiterStr" != "ARBITER" ];then
log "ERROR: abriter $slaveServerIp:27018: $arbiterStr, may be you need restart mongodb with 'systemctl restart mongod-arbiter' command in $slaveServerIp."
fi
log "check arbiter end."
}


logfile "**************************$nowtime**********************************"
testConfig
initTwoMemberReplicaSet
isElectPrimary
addArbiter
chekArbiter
log "init end..."

View Code

6、重新配置 replica set

#!/bin/bash
basedir=$(cd "$(dirname "$0")";pwd)

source ./app.properties


nowtime=<span style="color: rgba(0, 0, 255, 1)">date</span> --<span style="color: rgba(0, 0, 255, 1)">date</span>=<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">0 days ago</span><span style="color: rgba(128, 0, 0, 1)">'</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">+%Y%m%d%H%M%S</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
daytime=<span style="color: rgba(0, 0, 255, 1)">date</span> --<span style="color: rgba(0, 0, 255, 1)">date</span>=<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">0 days ago</span><span style="color: rgba(128, 0, 0, 1)">'</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">+%Y%m%d</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">


logPath=./log/init_repliaset_$daytime.log
function log(){
echo $1 | tee -a $logPath
}


function logfile(){
echo $1 >> $logPath
}


function testConfig(){
log "check relate config."
if [ "$masterServerIp" == "masterIp" ];then
log "ERROR: masterServerIp is not correct in the file app.properties"
exit 1
fi


<span style="color: rgba(0, 0, 255, 1)">if</span> [ <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">$slaveServerIp</span><span style="color: rgba(128, 0, 0, 1)">"</span> == <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">slaveIp</span><span style="color: rgba(128, 0, 0, 1)">"</span> ];<span style="color: rgba(0, 0, 255, 1)">then</span><span style="color: rgba(0, 0, 0, 1)">
    log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">ERROR: slaveServerIp is not correct in the file app.properties</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
    exit </span><span style="color: rgba(128, 0, 128, 1)">1</span>
<span style="color: rgba(0, 0, 255, 1)">fi</span><span style="color: rgba(0, 0, 0, 1)">

## get current replica set master node
local currMasterNode</span>=`mongo  -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">PRIMARY</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">name</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">cut</span> -d <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">:</span><span style="color: rgba(128, 0, 0, 1)">"</span> -f <span style="color: rgba(128, 0, 128, 1)">2</span> | <span style="color: rgba(0, 0, 255, 1)">sed</span> <span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">s/\"//g</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">`

</span><span style="color: rgba(0, 0, 255, 1)">if</span> [ <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">`ifconfig | grep $currMasterNode`</span><span style="color: rgba(128, 0, 0, 1)">"</span> == <span style="color: rgba(128, 0, 0, 1)">""</span> ];<span style="color: rgba(0, 0, 255, 1)">then</span><span style="color: rgba(0, 0, 0, 1)">
    log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">the current server has no mongodb master node, please login on to $currMasterNode execute this script.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
    exit </span><span style="color: rgba(128, 0, 128, 1)">1</span>
<span style="color: rgba(0, 0, 255, 1)">fi</span><span style="color: rgba(0, 0, 0, 1)">
## test the connection

</span><span style="color: rgba(0, 0, 255, 1)">echo</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">use admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;<span style="color: rgba(0, 0, 0, 1)"> test.js
</span><span style="color: rgba(0, 0, 255, 1)">echo</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.slaveOk()</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;&gt;<span style="color: rgba(0, 0, 0, 1)"> test.js
</span><span style="color: rgba(0, 0, 255, 1)">echo</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">show dbs</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;&gt;<span style="color: rgba(0, 0, 0, 1)"> test.js

</span><span style="color: rgba(0, 0, 255, 1)">cat</span> test.js | mongo --host $slaveServerIp -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;&gt;<span style="color: rgba(0, 0, 0, 1)"> $logPath

</span><span style="color: rgba(0, 0, 255, 1)">if</span> [ $? != <span style="color: rgba(128, 0, 128, 1)">0</span> ];<span style="color: rgba(0, 0, 255, 1)">then</span><span style="color: rgba(0, 0, 0, 1)">
        log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">mongodb instance which port is 27017 in $slaveServerIp server can not connect.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
        exit </span><span style="color: rgba(128, 0, 128, 1)">1</span><span style="color: rgba(0, 0, 0, 1)">;
</span><span style="color: rgba(0, 0, 255, 1)">fi</span>

<span style="color: rgba(0, 0, 255, 1)">cat</span> test.js | mongo --host $masterServerIp -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;&gt;<span style="color: rgba(0, 0, 0, 1)"> $logPath

</span><span style="color: rgba(0, 0, 255, 1)">if</span> [ $? != <span style="color: rgba(128, 0, 128, 1)">0</span> ];<span style="color: rgba(0, 0, 255, 1)">then</span><span style="color: rgba(0, 0, 0, 1)">
        log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">mongodb instance which port is 27017 in $slaveServerIp server can not connect.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
        exit </span><span style="color: rgba(128, 0, 128, 1)">1</span><span style="color: rgba(0, 0, 0, 1)">;
</span><span style="color: rgba(0, 0, 255, 1)">fi</span>

<span style="color: rgba(0, 0, 255, 1)">cat</span> test.js | mongo --host $slaveServerIp --port <span style="color: rgba(128, 0, 128, 1)">27018</span> -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> &gt;&gt;<span style="color: rgba(0, 0, 0, 1)"> $logPath

</span><span style="color: rgba(0, 0, 255, 1)">if</span> [ $? != <span style="color: rgba(128, 0, 128, 1)">0</span> ];<span style="color: rgba(0, 0, 255, 1)">then</span><span style="color: rgba(0, 0, 0, 1)">
        log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">mongodb instance which port is 27018 in $slaveServerIp server can not connect.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
        ## 有时，当主从服务器都重启之后，有一个仲裁节点由于不在replica set中，但配置文件中却存在replica的配置，造成不能够正常启动，但reconfig replica set后，需要将该节点reconfig到replica set中，故此处不能因为不能连接就执行exit，但输出错误信息给出提示，即使服务未启动，
        ## 执行rs.addArb()也可以添加仲裁节点，但必须确定添加的仲裁节点会启动，否则即使通过rs.remove删除掉了该仲裁节点，但主节点日志中也会一直打印错误信息，
</span><span style="color: rgba(0, 0, 255, 1)">fi</span>

<span style="color: rgba(0, 0, 255, 1)">rm</span> -<span style="color: rgba(0, 0, 0, 1)">rf test.js
log </span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">check relate config end.</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">



}


function initTwoMemberReplicaSet(){
log "reconfig two member replica set."
echo "use admin" > reconfig.js
## the _id must be the same as before
## find the master server id in previous replica set
local masterId=mongo -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">$masterServerIp:27017</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">1</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">_id</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">cut</span> -d <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">:</span><span style="color: rgba(128, 0, 0, 1)">"</span> -f <span style="color: rgba(128, 0, 128, 1)">2</span>|<span style="color: rgba(0, 0, 255, 1)">sed</span> <span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">s/,//g</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">
## find the slave server id in previous replica set
local slaveId=mongo -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">$slaveServerIp:27017</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">1</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">_id</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">cut</span> -d <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">:</span><span style="color: rgba(128, 0, 0, 1)">"</span> -f <span style="color: rgba(128, 0, 128, 1)">2</span>|<span style="color: rgba(0, 0, 255, 1)">sed</span> <span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">s/,//g</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">
echo "config = {_id:"mongoSet", "protocolVersion" : 1, members:[{_id:$masterId,host:"$masterServerIp:27017",priority:2},{_id:$slaveId,host:"$slaveServerIp:27017",priority:1}]}" >> reconfig.js
echo "rs.reconfig(config, {force:true})" >> reconfig.js
cat reconfig.js | mongo -uroot -pabc123 --authenticationDatabase "admin" >> $logPath
## sleep 3 second for primary election.
sleep 3s
log "reconfig two member replica set end."
}


function isElectPrimary(){
log "check is the master node selected."
local masterStr=mongo -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">PRIMARY</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">name</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span><span style="color: rgba(0, 0, 0, 1)"> $masterServerIp
local count=0
while [[ "$masterStr" == "" ]];do
sleep 1s
count=$((count+1))
masterStr=mongo -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">PRIMARY</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">name</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span><span style="color: rgba(0, 0, 0, 1)"> $masterServerIp
if [ "$masterStr" != "" ];then
log "the master node is selected."
break
fi
if [ "$count" == "30" ];then
log "ERROR: arbiter configure timeout, please configure manually with 'rs.addArb("$slaveServerIp:27018")' in $masterServerIp:27017"
exit 1
fi
done
log "check is the master node selected end."
}


function addArbiter(){
log "remove arbiter in the master server."
## master server do not deploy arbiter, when reconfig, after the master node reselected you must specify the --post for delete or add
local beforeArbiterIp=mongo -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">ARBITER</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">name</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">cut</span> -d <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">:</span><span style="color: rgba(128, 0, 0, 1)">"</span> -f <span style="color: rgba(128, 0, 128, 1)">2</span> | <span style="color: rgba(0, 0, 255, 1)">sed</span> <span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">s/\"//g</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">
if [ "echo $masterServerIp | grep $beforeArbiterIp" != "" ];then
log "remove $masterServerIp:27018 in replica set."
mongo -uroot -pabc123 --authenticationDatabase "admin" --host $masterServerIp --eval "rs.remove("$masterServerIp:27018")"
fi
log "remove arbiter in the master server end."
log "add arbiter ..."
mongo  -uroot -pabc123 --authenticationDatabase "admin" --host $masterServerIp --eval "rs.addArb("$slaveServerIp:27018")"
log "add arbiter end."
}


function chekArbiter(){
log "check arbiter."
local arbiterStr=mongo -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">$slaveServerIp:27018</span><span style="color: rgba(128, 0, 0, 1)">"</span> -A <span style="color: rgba(128, 0, 128, 1)">3</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">ARBITER</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
## arbiter connect need time， set to 15 seconds
local count=0
while [[ "$arbiterStr" == "" ]];do
sleep 1s
count=$((count+1))
arbiterStr=mongo -uroot -pabc123 --authenticationDatabase <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">admin</span><span style="color: rgba(128, 0, 0, 1)">"</span> --eval <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">rs.status()</span><span style="color: rgba(128, 0, 0, 1)">"</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">stateStr</span><span style="color: rgba(128, 0, 0, 1)">"</span> -B <span style="color: rgba(128, 0, 128, 1)">4</span>|<span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">$slaveServerIp:27018</span><span style="color: rgba(128, 0, 0, 1)">"</span> -A <span style="color: rgba(128, 0, 128, 1)">3</span> | <span style="color: rgba(0, 0, 255, 1)">grep</span> <span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">ARBITER</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">
if [ "$arbiterStr" != "" ];then
log "the arbiter node is selected."
break
fi
## wait for 15 seconds
if [ "$count" == "15" ];then
log "ERROR: abriter $slaveServerIp:27018: $arbiterStr, may be you need restart mongodb with 'systemctl restart mongod-arbiter' command in $slaveServerIp."
break
fi
done
log "check arbiter end."
}


logfile "**************************$nowtime**********************************"
testConfig
initTwoMemberReplicaSet
isElectPrimary
addArbiter
chekArbiter


log "init end..."

View Code

脚本中通过 rs.addArb()添加未启动或者不存在的 arbiter 节点，可以添加成功，但主节点日志中会一直打印该 arbiter 节点相关的错误信息，即使通过 rs.remove() 删除掉该 arbiter 节点，错误信息也会打印，该问题，重启主节点可以解决

7、配置文件 app.properties

masterServerIp=masterIp
slaveServerIp=slaveIp
View Code

执行初始化和重新配置 replica set 之前需要确认 app.properties 中配置是正确的

8、无论是初始化 replica set 或者重新配置 replica set，前几次都会出现 not reachable/healthy，此时根据 shell 页面打印的提示，在对应的服务器上执行 systemctl restart mongod-arbiter 即可