mongodb主从数据同步

1. 下载mongodb

下载地址：https://www.mongodb.org/dl/linux/x86_64-rhel62

2. 解压
tar zxf mongodb-linux-x86_64-rhel62-v3.2-latest.tgz
mv mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/ /usr/local/mongodb

3. 添加环境变量
echo "export PATH=$PATH:/usr/local/mongodb/bin" > /etc/profile.d/mongodb.sh
source /etc/profile.d/mongodb.sh

4. 创建mongodb组和用户
groupadd -r mongod && useradd -s /sbin/nologin -g mongod -r mongod

5. 创建mongodb数据库目录和日志目录并添加权限(目录改变启动脚本也需改变)
mkdir -p /home/mongodb/mongodata/
mkdir -p /home/mongodb/mongolog
chown -R mongod:mongod /home/mongodb/mongodata
chown -R mongod:mongod /home/mongodb/mongolog

6. 系统环境设置：
vim /etc/security/limits.conf
* soft nproc 640000
* hard nproc 640000
* soft nofile 640000
* hard nofile 640000

vim /etc/profile && source /etc/profile
ulimit -n 640000
ulimit -u 640000

7. 添加mongodb配置文件,并编辑profile文件
vim /etc/mongod_27018.conf
logpath=/home/mongodb/mongolog/mongod.log
logappend=true
fork=true
port=27018
dbpath=/home/mongodb/mongodata
pidfilepath=/home/mongodb/mongolog/27018.pid
oplogSize=4096
maxConns=640000
directoryperdb=true
nojournal=true
master=true
# source=192.168.131.130:27018
bind_ip=192.168.131.128

vim /etc/rc.d/rc.sysinit
echo never > /sys/kernel/mm/redhat_transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag

8. 添加mongodb启动脚本，并设置为自启动
vim /etc/init.d/mongodb
chmod +x /etc/init.d/mongodb
chkconfig --add mongodb
chkconfig mongodb on

#!/bin/sh
# chkconfig: 2345 93 18
# description:MongoDB

#默认参数设置
#mongodb 家目录
MONGODB_HOME=/usr/local/mongodb

#mongodb 启动命令
MONGODB_BIN=$MONGODB_HOME/bin/mongod

#mongodb 配置文件
MONGODB_CONF=/etc/mongod_27018.conf

#mongodb PID
MONGODB_PID=/home/mongodb/mongolog/27018.pid

#最大文件打开数量限制
SYSTEM_MAXFD=640000

#mongodb 名字
MONGODB_NAME="mongodb"
. /etc/rc.d/init.d/functions

if [ ! -f $MONGODB_BIN ]
then
echo "$MONGODB_NAME startup: $MONGODB_BIN not exists! "
exit
fi


start(){
ulimit -HSn $SYSTEM_MAXFD
$MONGODB_BIN --config="$MONGODB_CONF"
ret=$?
if [ $ret -eq 0 ]; then
action $"Starting $MONGODB_NAME: " /bin/true
else
action $"Starting $MONGODB_NAME: " /bin/false
fi

}

stop(){
PID=$(ps aux |grep "$MONGODB_NAME" |grep "$MONGODB_CONF" |grep -v grep |wc -l)
if [[ $PID -eq 0 ]];then
action $"Stopping $MONGODB_NAME: " /bin/false
exit
fi
kill -HUP `cat $MONGODB_PID`
ret=$?
if [ $ret -eq 0 ]; then
action $"Stopping $MONGODB_NAME: " /bin/true
rm -f $MONGODB_PID
else
action $"Stopping $MONGODB_NAME: " /bin/false
fi

}

restart() {

stop
sleep 2
start
}

case "$1" in
start)
start
;;
stop)
stop
;;
status)
status $prog
;;
restart)
restart
;;
*)
echo $"Usage: $0 {start|stop|status|restart}"
esac

9. 启动mongodb，创建数据库用于测试
# service mongodb start
# mongo IP:PORT
> use test;
> db.doubi.insert({"name":"tutorials yiibai"})

10. 创建从服务器，步骤同上，更改配置文件
# vim /etc/mongod_27018.conf
logpath=/home/mongodb/mongolog/mongod.log
logappend=true
fork=true
port=27018
dbpath=/home/mongodb/mongodata
pidfilepath=/home/mongodb/mongolog/27018.pid
oplogSize=4096
maxConns=640000
directoryperdb=true
nojournal=true
slave=true
source=主ip:端口
bind_ip = 本机ip

11. 其他同主服务器一样配置即可，然后开启服务验证
出现Error: listDatabases failed:{ "ok" : 0, "errmsg" : "not master and slaveOk=false", "code" : 13435 }
说明从服务器不允许读写，可以执行以下命令解决。
> rs.slaveOk();

12. 从服务器需要注意更改端口号和启动脚本

logpath=/home/mongodb/mongolog/mongod.log
logappend=true
fork=true
port=27018
dbpath=/home/mongodb/mongodata
pidfilepath=/home/mongodb/mongolog/27018.pid
oplogSize=4096
maxConns=640000
directoryperdb=true
nojournal=true
#master=true
slave=true
source=117.78.1.xx:27018

13. 开启zabbix自定义监控mongodb
vim /usr/local/zabbix/etc/zabbix_agentd.conf
265行
UnsafeUserParameters=1
UserParameter=MongoDB.Status[*],/bin/echo "db.serverStatus().$1" | /usr/local/mongodb/bin/mongo localhost:30001 | grep -w "$2" |cut -d, -f1|cut -d: -f2

UserParameter=MongoDB.exist[*],/bin/echo "db.serverStatus()" | /usr/local/mongodb/bin/mongo localhost:30000 |tail -3|head -1|cut -d: -f1|grep -o ok

UserParameter=MongoDB.exist[*],/bin/echo "db.serverStatus()" |mongo localhost:30000 |tail -3|grep -o ok
ok

重启agentd
套用模板
服务端验证：
/usr/local/zabbix/bin/zabbix_get -s 10.124.156.251 -k MongoDB.Status[*]