Keepalived+MySQL實現高可用
MySQL的高可用方案有不少，好比Cluster，MMM，MHA，DRBD等，這些都比較複雜，我前面的文章也有介紹。最近Oracle官方也推出了Fabric。有時咱們不須要這麼複雜的環境，這些方案各有優劣。有時簡單的且咱們可以hold住的方案纔是適合咱們的。好比MySQL Replication，而後加上各類高可用軟件，好比Keepalived等，就能實現咱們須要的高可用環境。html
MySQL架構爲master/slave，當master故障時，vip漂移到slave上。提供服務。固然也能夠設置爲雙master，可是不是每一個方案都是完美的。這裏設置爲雙master有個問題須要注意，好比，當用戶發表文章時，因爲此時主機的壓力很大時，假設落後2000秒，那麼這臺主機宕機了，另外一臺主機接管（vip漂移到從機上）時，由於同步延時大，用戶剛纔發表的文章還沒複製過來，因而用戶又發表了一遍文章，當原來的master修復好後，因爲I/O和SQL線程還處於開啓狀態，所以還會繼續同步剛纔沒有同步複製完的數據，這時有可能把用戶新發表的文章更改掉。這裏因此採用master/slave架構。在這種架構中，故障切換之後，採起手動操做的方式與新的master進行復制。node
簡單環境以下：mysql
master 192.168.0.100 slave 192.168.0.101 VIP 192.168.0.88
主從複製環境的搭建我這裏就不演示了。有須要的同窗本身看看官方手冊。下面直接介紹keepalived的安裝及配置使用。sql
1.keepalived軟件安裝（主從操做同樣）bash
[root@mysql-server-01 ~]# wget -q http://www.keepalived.org/software/keepalived-1.2.13.tar.gz [root@mysql-server-01 ~]# tar xf keepalived-1.2.13.tar.gz [root@mysql-server-01 ~]# cd keepalived-1.2.13 [root@mysql-server-01 keepalived-1.2.13]# ./configure && make && make install
[root@mysql-server-01 keepalived]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/ [root@mysql-server-01 keepalived]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/ [root@mysql-server-01 keepalived]# mkdir /etc/keepalived [root@mysql-server-01 keepalived]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/ [root@mysql-server-01 keepalived]# cp /usr/local/sbin/keepalived /usr/sbin/ [root@mysql-server-01 keepalived]# chkconfig --add keepalived [root@mysql-server-01 keepalived]# chkconfig --level 345 keepalived on
2.主從的配置文件修改（主的keepalived配置文件修改後以下，其實不相同的就優先級而已）
master的keepalived配置文件以下服務器
[root@mysql-server-01 keepalived]# cat keepalived.conf global_defs { router_id MySQL-HA } vrrp_script check_run { script "/data/sh/mysql_check.sh" interval 300 } vrrp_sync_group VG1 { group { VI_1 } } vrrp_instance VI_1 { state BACKUP interface eth1 virtual_router_id 51 priority 100 advert_int 1 nopreempt authentication { auth_type PASS auth_pass 1111 } track_script { check_run } notify_master /data/sh/master.sh notify_backup /data/sh/backup.sh notify_stop /data/sh/stop.sh virtual_ipaddress { 192.168.0.88 } } [root@mysql-server-01 keepalived]#
slave的keepalived配置文件修改之後以下：架構
[root@mysql-server-02 keepalived]# cat keepalived.conf global_defs { router_id MySQL-HA } vrrp_script check_run { script "/data/sh/mysql_check.sh" interval 300 } vrrp_sync_group VG1 { group { VI_1 } } vrrp_instance VI_1 { state BACKUP interface eth1 virtual_router_id 51 priority 90 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { check_run } notify_master /data/sh/master.sh notify_backup /data/sh/backup.sh notify_stop /data/sh/stop.sh virtual_ipaddress { 192.168.0.88 } } [root@mysql-server-02 keepalived]#
其中有幾個關鍵參數的地方：
notify_master：狀態改變爲master之後執行的腳本。ide
notify_backup: 狀態改變爲backup之後執行的腳本。測試
notify_fault: 狀態改變爲fault後執行的腳本。ui
notify_stop: VRRP中止之後執行的腳本。
state backup：咱們都設置爲了backup，就是爲了發生故障之後不會自動切換。
nopreempt： 不進行搶佔操做
其中用到了這4個腳本：backup.sh master.sh mysql_check.sh stop.sh
mysql_check.sh是爲了檢查mysqld進程是否存活的腳本，當發現鏈接不上mysql，自動把keepalived進程幹掉，讓VIP進行漂移。
下面的腳本主從服務器上面都有，只是從服務器上面的master.sh有些不同。添加了當slave提高爲主庫時，發送郵件通知。
[root@mysql-server-01 sh]# cat mysql_check.sh #!/bin/bash . /root/.bash_profile count=1 while true do mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14520.sock -e "show status;" > /dev/null 2>&1 i=$? ps aux | grep mysqld | grep -v grep > /dev/null 2>&1 j=$? if [ $i = 0 ] && [ $j = 0 ] then exit 0 else if [ $i = 1 ] && [ $j = 0 ] then exit 0 else if [ $count -gt 5 ] then break fi let count++ continue fi fi done /etc/init.d/keepalived stop [root@mysql-server-01 sh]#
master.sh的做用是狀態改成master之後執行的腳本。首先判斷複製是否有延遲，若是有延遲，等1分鐘後，不管是否有延遲。都跳過，並中止複製。而且受權帳號，記錄binlog和pos點。
[root@mysql-server-02 sh]# cat master.sh #!/bin/bash . /root/.bash_profile Master_Log_File=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show slave status\G" | grep -w Master_Log_File | awk -F": " '{print $2}') Relay_Master_Log_File=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show slave status\G" | grep -w Relay_Master_Log_File | awk -F": " '{print $2}') Read_Master_Log_Pos=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show slave status\G" | grep -w Read_Master_Log_Pos | awk -F": " '{print $2}') Exec_Master_Log_Pos=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show slave status\G" | grep -w Exec_Master_Log_Pos | awk -F": " '{print $2}') i=1 while true do if [ $Master_Log_File = $Relay_Master_Log_File ] && [ $Read_Master_Log_Pos -eq $Exec_Master_Log_Pos ] then echo "ok" break else sleep 1 if [ $i -gt 60 ] then break fi continue let i++ fi done mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "stop slave;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global innodb_support_xa=0;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global sync_binlog=0;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global innodb_flush_log_at_trx_commit=0;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "flush logs;GRANT ALL PRIVILEGES ON *.* TO 'admin'@'%' IDENTIFIED BY '123456';flush privileges;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show master status;" > /tmp/master_status_$(date "+%y%m%d-%H%M").txt [root@mysql-server-02 sh]#
slave上的master.sh
[root@mysql-server-02 sh]# cat master.sh #!/bin/bash . /root/.bash_profile Master_Log_File=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show slave status\G" | grep -w Master_Log_File | awk -F": " '{print $2}') Relay_Master_Log_File=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show slave status\G" | grep -w Relay_Master_Log_File | awk -F": " '{print $2}') Read_Master_Log_Pos=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show slave status\G" | grep -w Read_Master_Log_Pos | awk -F": " '{print $2}') Exec_Master_Log_Pos=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show slave status\G" | grep -w Exec_Master_Log_Pos | awk -F": " '{print $2}') i=1 while true do if [ $Master_Log_File = $Relay_Master_Log_File ] && [ $Read_Master_Log_Pos -eq $Exec_Master_Log_Pos ] then echo "ok" break else sleep 1 if [ $i -gt 60 ] then break fi continue let i++ fi done mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "stop slave;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global innodb_support_xa=0;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global sync_binlog=0;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global innodb_flush_log_at_trx_commit=0;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "flush logs;GRANT ALL PRIVILEGES ON *.* TO 'admin'@'%' IDENTIFIED BY '123456';flush privileges;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show master status;" > /tmp/master_status_$(date "+%y%m%d-%H%M").txt #當slave提高爲主之後，發送郵件 echo "#####################################" > /tmp/status echo "salve已經提高爲主庫，請進行檢查！" >> /tmp/status ifconfig | sed -n '/inet /{s/.*addr://;s/ .*//;p}' | grep -v 127.0.0.1 >> /tmp/status mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -Nse "show variables like 'port'" >> /tmp/status echo "#####################################" >> /tmp/status master=`cat /tmp/status` echo "$master" | mutt -s "slave to primary!!!" 13143753516@139.com
腳本中檢查複製是否延時的思想以下：
一、首先看 Relay_Master_Log_File 和 Master_Log_File 是否有差別
二、若是Relay_Master_Log_File 和 Master_Log_File 有差別的話，那說明延遲很大了
三、若是Relay_Master_Log_File 和 Master_Log_File 沒有差別，再來看Exec_Master_Log_Pos 和 Read_Master_Log_Pos 的差別
而不是經過Seconds_Behind_Master去判斷，該值表示slave上SQL線程和IO線程之間的延遲，實際上還要考慮到 Master_Log_File 和 Relay_Master_Log_File 是否有差距，更嚴謹的則是要同時在master上執行show master status進行對比。這也是MHA在切換過程當中能夠作到的。MMM的切換也只是在從庫上執行了show slave status。因此數據一致性要求仍是MHA給力。扯遠了。^_^
backup.sh腳本的做用是狀態改變爲backup之後執行的腳本。
[root@mysql-server-02 sh]# cat backup.sh #!/bin/bash . /root/.bash_profile mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "GRANT ALL PRIVILEGES ON *.* TO 'admin'@'%' IDENTIFIED BY '123456';flush privileges;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global event_scheduler=0;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global innodb_support_xa=0;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global sync_binlog=0;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global innodb_flush_log_at_trx_commit=0;"
stop.sh 表示keepalived中止之後須要執行的腳本。更改密碼，設置參數，檢查是否還有寫入操做，最後不管是否執行完畢，都退出。
[root@mysql-server-02 sh]# cat stop.sh #!/bin/bash . /root/.bash_profile mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "GRANT ALL PRIVILEGES ON *.* TO 'admin'@'%' IDENTIFIED BY '1q2w3e4r';flush privileges;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global innodb_support_xa=1;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global sync_binlog=1;" mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "set global innodb_flush_log_at_trx_commit=1;" M_File1=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show master status\G" | awk -F': ' '/File/{print $2}') M_Position1=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show master status\G" | awk -F': ' '/Position/{print $2}') sleep 1 M_File2=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show master status\G" | awk -F': ' '/File/{print $2}') M_Position2=$(mysql -uroot -pmsandbox -S /tmp/mysql_sandbox14521.sock -e "show master status\G" | awk -F': ' '/Position/{print $2}') i=1 while true do if [ $M_File1 = $M_File1 ] && [ $M_Position1 -eq $M_Position2 ] then echo "ok" break else sleep 1 if [ $i -gt 60 ] then break fi continue let i++ fi done [root@mysql-server-02 sh]#
到這裏基本就介紹完了。最後咱們先看主從複製是否正常，若是正常，而後分別啓動keepalived，而後進行故障切換測試。
slave狀態：
node2 [localhost] {msandbox} ((none)) > pager cat | egrep 'Master_Log_File|Relay_Master_Log_File|Read_Master_Log_Pos|Exec_Master_Log_Pos|Running' PAGER set to 'cat | egrep 'Master_Log_File|Relay_Master_Log_File|Read_Master_Log_Pos|Exec_Master_Log_Pos|Running'' node2 [localhost] {msandbox} ((none)) > show slave status\G Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 409 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: Yes Exec_Master_Log_Pos: 409 Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it 1 row in set (0.00 sec) node2 [localhost] {msandbox} ((none)) >
master 狀態：
node1 [localhost] {msandbox} ((none)) > show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000001 | 409 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec) node1 [localhost] {msandbox} ((none)) >
根據我前面給的判斷條件，能夠看出個人複製沒有任何延時。
下面分別在master上和slave上啓動keepalived進程。以及查看日誌（上面的查看只是給你們說明如何判斷複製是否延遲）
master
[root@mysql-server-01 sh]# /etc/init.d/keepalived start Starting keepalived: [ OK ] [root@mysql-server-01 sh]# tail -f /var/log/messages Jul 20 20:48:03 mysql-server-01 Keepalived_vrrp[13040]: Netlink reflector reports IP 192.168.87.134 added Jul 20 20:48:03 mysql-server-01 Keepalived_vrrp[13040]: Netlink reflector reports IP 192.168.0.100 added Jul 20 20:48:03 mysql-server-01 Keepalived_vrrp[13040]: Registering Kernel netlink reflector Jul 20 20:48:03 mysql-server-01 Keepalived_vrrp[13040]: Registering Kernel netlink command channel Jul 20 20:48:03 mysql-server-01 Keepalived_vrrp[13040]: Registering gratuitous ARP shared channel Jul 20 20:48:03 mysql-server-01 Keepalived_healthcheckers[13039]: Netlink reflector reports IP 192.168.0.100 added Jul 20 20:48:03 mysql-server-01 Keepalived_healthcheckers[13039]: Netlink reflector reports IP 192.168.87.134 added Jul 20 20:48:03 mysql-server-01 Keepalived_healthcheckers[13039]: Netlink reflector reports IP 192.168.0.100 added Jul 20 20:48:03 mysql-server-01 Keepalived_healthcheckers[13039]: Registering Kernel netlink reflector Jul 20 20:48:03 mysql-server-01 Keepalived_healthcheckers[13039]: Registering Kernel netlink command channel Jul 20 20:48:23 mysql-server-01 Keepalived_healthcheckers[13039]: Opening file '/etc/keepalived/keepalived.conf'. Jul 20 20:48:23 mysql-server-01 Keepalived_healthcheckers[13039]: Configuration is using : 6489 Bytes Jul 20 20:48:23 mysql-server-01 Keepalived_vrrp[13040]: Opening file '/etc/keepalived/keepalived.conf'. Jul 20 20:48:23 mysql-server-01 Keepalived_vrrp[13040]: Configuration is using : 66476 Bytes Jul 20 20:48:23 mysql-server-01 Keepalived_vrrp[13040]: Using LinkWatch kernel netlink reflector... Jul 20 20:48:23 mysql-server-01 Keepalived_healthcheckers[13039]: Using LinkWatch kernel netlink reflector... Jul 20 20:48:23 mysql-server-01 Keepalived_vrrp[13040]: VRRP_Instance(VI_1) Entering BACKUP STATE Jul 20 20:48:23 mysql-server-01 Keepalived_vrrp[13040]: VRRP sockpool: [ifindex(3), proto(112), unicast(0), fd(10,11)] Jul 20 20:48:23 mysql-server-01 Keepalived_vrrp[13040]: VRRP_Script(check_run) succeeded Jul 20 20:48:27 mysql-server-01 Keepalived_vrrp[13040]: VRRP_Instance(VI_1) Transition to MASTER STATE Jul 20 20:48:27 mysql-server-01 Keepalived_vrrp[13040]: VRRP_Group(VG1) Syncing instances to MASTER state Jul 20 20:48:28 mysql-server-01 Keepalived_vrrp[13040]: VRRP_Instance(VI_1) Entering MASTER STATE Jul 20 20:48:28 mysql-server-01 Keepalived_vrrp[13040]: VRRP_Instance(VI_1) setting protocol VIPs. Jul 20 20:48:28 mysql-server-01 Keepalived_vrrp[13040]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth1 for 192.168.0.88 Jul 20 20:48:28 mysql-server-01 Keepalived_healthcheckers[13039]: Netlink reflector reports IP 192.168.0.88 added Jul 20 20:48:33 mysql-server-01 Keepalived_vrrp[13040]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth1 for 192.168.0.88
slave
[root@mysql-server-02 tmp]# /etc/init.d/keepalived start Starting keepalived: [ OK ] [root@mysql-server-02 tmp]# tail -f /var/log/messages Jul 20 20:48:14 mysql-server-02 Keepalived_vrrp[10680]: Netlink reflector reports IP fe80::20c:29ff:fefe:dc91 added Jul 20 20:48:14 mysql-server-02 Keepalived_healthcheckers[10679]: Netlink reflector reports IP 192.168.0.101 added Jul 20 20:48:14 mysql-server-02 Keepalived_healthcheckers[10679]: Netlink reflector reports IP fe80::20c:29ff:fefe:dc91 added Jul 20 20:48:14 mysql-server-02 Keepalived_vrrp[10680]: Netlink reflector reports IP fe80::20c:29ff:fefe:dc9b added Jul 20 20:48:14 mysql-server-02 Keepalived_vrrp[10680]: Registering Kernel netlink reflector Jul 20 20:48:14 mysql-server-02 Keepalived_healthcheckers[10679]: Netlink reflector reports IP fe80::20c:29ff:fefe:dc9b added Jul 20 20:48:14 mysql-server-02 Keepalived_healthcheckers[10679]: Registering Kernel netlink reflector Jul 20 20:48:14 mysql-server-02 Keepalived_vrrp[10680]: Registering Kernel netlink command channel Jul 20 20:48:14 mysql-server-02 Keepalived_healthcheckers[10679]: Registering Kernel netlink command channel Jul 20 20:48:14 mysql-server-02 Keepalived_vrrp[10680]: Registering gratuitous ARP shared channel Jul 20 20:48:34 mysql-server-02 Keepalived_healthcheckers[10679]: Opening file '/etc/keepalived/keepalived.conf'. Jul 20 20:48:34 mysql-server-02 Keepalived_healthcheckers[10679]: Configuration is using : 6467 Bytes Jul 20 20:48:34 mysql-server-02 Keepalived_vrrp[10680]: Opening file '/etc/keepalived/keepalived.conf'. Jul 20 20:48:34 mysql-server-02 Keepalived_vrrp[10680]: Configuration is using : 66454 Bytes Jul 20 20:48:34 mysql-server-02 Keepalived_vrrp[10680]: Using LinkWatch kernel netlink reflector... Jul 20 20:48:34 mysql-server-02 Keepalived_healthcheckers[10679]: Using LinkWatch kernel netlink reflector... Jul 20 20:48:34 mysql-server-02 Keepalived_vrrp[10680]: VRRP_Instance(VI_1) Entering BACKUP STATE Jul 20 20:48:34 mysql-server-02 Keepalived_vrrp[10680]: VRRP sockpool: [ifindex(3), proto(112), unicast(0), fd(10,11)] Jul 20 20:48:35 mysql-server-02 Keepalived_vrrp[10680]: VRRP_Script(check_run) succeeded
能夠看見VIP已經綁定在了master上，執行ip addr看看是否有這個VIP
[root@mysql-server-01 ~]# ip addr | grep eth1 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 inet 192.168.0.100/24 brd 192.168.0.255 scope global eth1 inet 192.168.0.88/32 scope global eth1 [root@mysql-server-01 ~]#
能夠看見vip也已經綁定成功。
如今咱們從遠程機器登錄看看，使用vip，建立測試庫，插入數據，最後模擬mysqld crash
[root@mysql-server-03 ~]# mysql -uadmin -p123456 -h 192.168.0.88 -P 14520 Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 47 Server version: 5.6.19-log MySQL Community Server (GPL) Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> create database dengyayun; Query OK, 1 row affected (0.01 sec) mysql> use dengyayun Database changed mysql> create table t1 ( id int); Query OK, 0 rows affected (0.38 sec) mysql> insert into t1 select 999; Query OK, 1 row affected (0.03 sec) Records: 1 Duplicates: 0 Warnings: 0 mysql>
發現使用vip登錄沒有問題，建立庫以及插入數據都木有問題。如今殺掉mysqld進程，看vip是否進行了漂移，以及查看數據是否存在。
[root@mysql-server-01 ~]# pkill -9 mysqld
過了一下子，報警郵件就到了，以及vip也已經切換了。以下：
查看slave上面的message信息，以下輸出：
[root@mysql-server-02 ~]# tail -n 20 /var/log/messages Jul 20 22:00:20 mysql-server-02 Keepalived_healthcheckers[13327]: Registering Kernel netlink command channel Jul 20 22:00:40 mysql-server-02 Keepalived_vrrp[13328]: Opening file '/etc/keepalived/keepalived.conf'. Jul 20 22:00:40 mysql-server-02 Keepalived_vrrp[13328]: Configuration is using : 66454 Bytes Jul 20 22:00:40 mysql-server-02 Keepalived_vrrp[13328]: Using LinkWatch kernel netlink reflector... Jul 20 22:00:40 mysql-server-02 Keepalived_healthcheckers[13327]: Opening file '/etc/keepalived/keepalived.conf'. Jul 20 22:00:40 mysql-server-02 Keepalived_healthcheckers[13327]: Configuration is using : 6467 Bytes Jul 20 22:00:40 mysql-server-02 Keepalived_healthcheckers[13327]: Using LinkWatch kernel netlink reflector... Jul 20 22:00:40 mysql-server-02 Keepalived_vrrp[13328]: VRRP_Instance(VI_1) Entering BACKUP STATE Jul 20 22:00:40 mysql-server-02 Keepalived_vrrp[13328]: VRRP sockpool: [ifindex(3), proto(112), unicast(0), fd(10,11)] Jul 20 22:00:40 mysql-server-02 Keepalived_vrrp[13328]: VRRP_Script(check_run) succeeded Jul 20 22:07:47 mysql-server-02 dhclient[7343]: DHCPREQUEST on eth0 to 192.168.87.254 port 67 (xid=0x4ada08db) Jul 20 22:07:47 mysql-server-02 dhclient[7343]: DHCPACK from 192.168.87.254 (xid=0x4ada08db) Jul 20 22:07:49 mysql-server-02 dhclient[7343]: bound to 192.168.87.135 -- renewal in 885 seconds. Jul 20 22:10:38 mysql-server-02 Keepalived_vrrp[13328]: VRRP_Instance(VI_1) Transition to MASTER STATE Jul 20 22:10:38 mysql-server-02 Keepalived_vrrp[13328]: VRRP_Group(VG1) Syncing instances to MASTER state Jul 20 22:10:39 mysql-server-02 Keepalived_vrrp[13328]: VRRP_Instance(VI_1) Entering MASTER STATE Jul 20 22:10:39 mysql-server-02 Keepalived_vrrp[13328]: VRRP_Instance(VI_1) setting protocol VIPs. Jul 20 22:10:39 mysql-server-02 Keepalived_vrrp[13328]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth1 for 192.168.0.88 Jul 20 22:10:39 mysql-server-02 Keepalived_healthcheckers[13327]: Netlink reflector reports IP 192.168.0.88 added Jul 20 22:10:44 mysql-server-02 Keepalived_vrrp[13328]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth1 for 192.168.0.88 [root@mysql-server-02 ~]#
最後咱們再次使用vip登錄；發現數據沒有異常。複製也中止了，由於已經切換爲主庫。
[root@mysql-server-03 ~]# mysql -uadmin -p123456 -h 192.168.0.88 -P14521 Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 301 Server version: 5.6.19-log MySQL Community Server (GPL) Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> select * from dengyayun.t1; +------+ | id | +------+ | 999 | +------+ 1 row in set (0.00 sec) mysql> pager cat | egrep 'IO_Running|SQL_Running' PAGER set to 'cat | egrep 'IO_Running|SQL_Running'' mysql> show slave status\G Slave_IO_Running: No Slave_SQL_Running: No Slave_SQL_Running_State: 1 row in set (0.00 sec) mysql>
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