MMM高可用實驗
1 環境：
1.1 OS and MYSQL verson:mysql
[root@mysql01 ~]# uname -a Linux mysql01 3.10.0-327.18.2.el7.x86_64 #1 SMP Thu May 12 11:03:55 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux [root@mysql01 ~]# /opt/mysql7/bin/mysql --version /opt/mysql7/bin/mysql Ver 14.14 Distrib 5.7.28, for el7 (x86_64) using EditLine wrapper
1.2 IP 規劃：sql
192.168.1.201 mysql01 #master1 192.168.1.202 mysql02 #master2 192.168.1.247 slave1 #slave 192.168.1.243 monitor #monitor
2 MySQL安裝：
#在全部SERVER上安裝MYSQL
#準備my.cnf, 注意全部SERVER的my.cnf中，server-id要不一樣bootstrap
# cat my.cnf
[client]
default-character-set = utf8
port = 3309
socket = /data/57.3309/mysql.sock
[mysqld]
server-id = 4
collation-server = utf8_unicode_ci
init-connect = 'SET NAMES utf8'
character-set-server = utf8
port = 3309
socket = /data/57.3309/mysql.sock
datadir = /data/57.3309/data
log-error = /data/57.3309/mysql.err
pid-file = /data/57.3309/mysql.pid
gtid_mode=on
#雙主設定auto-increment-increment 和auto-increment-offset 避免主鍵衝突
auto-increment-increment = 2
auto-increment-offset = 1
#mysql02
#auto-increment-offset = 2
#slave上不設置auto-increment-increment 和auto-increment-offset
sync_binlog = 1
sync_master_info = 1
sync_relay_log = 1
sync_relay_log_info = 1
enforce-gtid-consistency=on
skip-external-locking
key_buffer_size = 16M
max_allowed_packet = 1M
table_open_cache = 64
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
log-bin = /data/57.3309/data/mysql-bin
relay_log = /data/57.3309/data/relay-bin
##cascaded replication for slave to write binlog.
log_slave_updates = 1
read-only=1 #全部SERVER設定read-only
binlog_format = row
slow_query_log = 1
slow_query_log_file = /data/57.3309/log/slowquery.log
long_query_time = 1
general_log = off
general_log_file = /data/57.3309/log/general.log
#skip-grant-tables
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
[root@mysql01 data]# /opt/mysql7/bin/mysql_install_db --basedir='/opt/mysql7' --datadir='/data/57.3310/data' --user=mysql
2020-01-29 16:16:50 [WARNING] mysql_install_db is deprecated. Please consider switching to mysqld --initialize
2020-01-29 16:16:54 [WARNING] The bootstrap log isn't empty:
2020-01-29 16:16:54 [WARNING] 2020-01-29T08:16:50.886558Z 0 [Warning] --bootstrap is deprecated. Please consider using --initialize instead
2020-01-29T08:16:50.887365Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2020-01-29T08:16:50.887370Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)
#第一次：skip_grant_tables方式啓動
[root@mysql01 57.3310]# /opt/mysql7/bin/mysqld_safe --defaults-file='/data/57.3310/my.cnf' --skip-grant-tables --user=root &
Logging to '/data/57.3310/mysql.err'.
2020-01-29T08:39:04.537600Z mysqld_safe Starting mysqld daemon with databases from /data/57.3310/data
#修改root密碼
/opt/mysql7/bin/mysql -uroot -S /data/57.3310/mysql.soc #免密碼登陸
#update語句修改root密碼
mysql> update mysql.user set authentication_string=password('password123') where user='root' and host='localhost';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1
#update語句設置密碼不過時
mysql> update mysql.user set password_expired='N' where user='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
#刷新權限
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
#正常關閉，重啓MYSQL並登陸MYSQL
/opt/mysql7/bin/mysqladmin -uroot -ppassword123 -S /data/57.3310/mysql.sock shutdown
/opt/mysql7/bin/mysqld_safe --defaults-file='/data/57.3310/my.cnf' --user=root &
/opt/mysql7/bin/mysql -uroot -ppassword123 -S /data/57.3310/mysql.sock
#權限,全部SERVER上。
mysql> GRANT REPLICATION SLAVE ON *.* TO 'rep'@'%' IDENTIFIED BY 'password123';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
3 設定MYSQL主從複製
3.1 #複製架構：mysql01 <===>mysql02 主主複製，GTID方式，
mysql01===>slave 主從複製，傳統方式，
3.2 #mysql01 <===>mysql02
#mysql02上：架構
mysql> change master to MASTER_HOST='192.168.1.201',MASTER_USER='rep',MASTER_PASSWORD='password123',MASTER_PORT=3309,master_auto_position=1;
Query OK, 0 rows affected, 2 warnings (0.02 sec)
mysql>
mysql>
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.201
Master_User: rep
Master_Port: 3309
Connect_Retry: 60
Master_Log_File: mysql-bin.000004
Read_Master_Log_Pos: 76618
Relay_Log_File: relay-bin.000005
Relay_Log_Pos: 76831
Relay_Master_Log_File: mysql-bin.000004
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
#mysql01上：app
mysql> CHANGE MASTER TO MASTER_HOST='192.168.1.202',MASTER_PORT=3309,MASTER_USER='rep',MASTER_PASSWORD='password123',MASTER_AUTO_POSITION = 1;
Query OK, 0 rows affected, 2 warnings (0.00 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.202
Master_User: rep
Master_Port: 3309
Connect_Retry: 60
Master_Log_File: mysql-bin.000009
Read_Master_Log_Pos: 391
Relay_Log_File: relay-bin.000012
Relay_Log_Pos: 454
Relay_Master_Log_File: mysql-bin.000009
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
#slave上socket
mysql> change master to MASTER_HOST='192.168.1.201',MASTER_USER='rep',MASTER_PASSWORD='password123',MASTER_PORT=3309,MASTER_LOG_FILE='mysql-bin.000014',MASTER_LOG_POS=65754；
Query OK, 0 rows affected, 2 warnings (0.00 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.201
Master_User: rep
Master_Port: 3309
Connect_Retry: 60
Master_Log_File: mysql-bin.000014
Read_Master_Log_Pos: 65754
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000014
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
4 安裝MMM並配置：
4.1 #安裝enpl源並安裝MMM：ide
yum install epel-release.noarch yum install -y mysql-mmm-agent yum install -y mysql-mmm-monitor
4.2 #配置mmm用戶，因爲是全庫複製，只要在mysql01上配置，會自動同步到其餘SERVER：ui
GRANT PROCESS, SUPER, REPLICATION CLIENT ON *.* TO 'mmm_agent'@'192.168.1.%' IDENTIFIED BY 'password123'; GRANT REPLICATION CLIENT ON *.* TO 'mmm_monitor'@'192.168.1.%' IDENTIFIED BY 'password123';
4.3 #配置mmm設定檔：
#mysql01(master1)this
cd /etc/mysql-mmm/
cat mmm_common.conf
active_master_role writer
<host default>
cluster_interface eno33554992
pid_path /run/mysql-mmm-agent.pid
bin_path /usr/libexec/mysql-mmm/
replication_user rep
replication_password password123
agent_user mmm_agent
agent_password password123
</host>
<host mysql01>
ip 192.168.1.201
mysql_port 3309
mode master
peer mysql02
</host>
<host mysql02>
ip 192.168.1.202
mysql_port 3309
mode master
peer mysql01
</host>
<host slave1>
ip 192.168.1.247
mysql_port 3309
mode slave
</host>
#<host slave2>
# ip 192.168.1.242
# mysql_port 3310
# mode slave
#</host>
<role writer>
hosts mysql01, mysql02
ips 192.168.1.200
mode exclusive
</role>
<role reader>
hosts mysql01, mysql02,slave1
ips 192.168.1.251, 192.168.1.252, 192.168.1.253
mode balanced
</role>
[root@mysql01 mysql-mmm]# cat mmm_agent.conf
include mmm_common.conf
# The 'this' variable refers to this server. Proper operation requires
# that 'this' server (db1 by default), as well as all other servers, have the
# proper IP addresses set in mmm_common.conf.
this mysql01
#mysql02(master2)上：debug
[root@mysql02 mysql-mmm]# ll
total 8
-rw-r-----. 1 root root 235 Jan 29 20:54 mmm_agent.conf
-rw-r-----. 1 root root 991 Jan 30 14:02 mmm_common.conf
[root@mysql02 mysql-mmm]# cat mmm_common.conf
active_master_role writer
<host default>
cluster_interface eno33554992
pid_path /run/mysql-mmm-agent.pid
bin_path /usr/libexec/mysql-mmm/
replication_user rep
replication_password password123
agent_user mmm_agent
agent_password password123
</host>
<host mysql01>
ip 192.168.1.201
mysql_port 3309
mode master
peer mysql02
</host>
<host mysql02>
ip 192.168.1.202
mysql_port 3309
mode master
peer mysql01
</host>
<host slave1>
ip 192.168.1.247
mysql_port 3309
mode slave
</host>
#<host slave2>
# ip 192.168.1.242
# mysql_port 3310
# mode slave
#</host>
<role writer>
hosts mysql01, mysql02
ips 192.168.1.200
mode exclusive
</role>
<role reader>
hosts mysql01, mysql02,slave1
ips 192.168.1.251, 192.168.1.252, 192.168.1.253
mode balanced
</role>
[root@mysql02 mysql-mmm]# cat mmm_agent.conf
include mmm_common.conf
# The 'this' variable refers to this server. Proper operation requires
# that 'this' server (db1 by default), as well as all other servers, have the
# proper IP addresses set in mmm_common.conf.
this mysql02
[root@mysql02 mysql-mmm]#
#slave上：
[root@salve1 mysql-mmm]# pwd
/etc/mysql-mmm
[root@salve1 mysql-mmm]# ll
total 8
-rw-r-----. 1 root root 234 Jan 30 14:11 mmm_agent.conf
-rw-r-----. 1 root root 945 Jan 30 14:56 mmm_common.conf
[root@salve1 mysql-mmm]# cat mmm_common.conf
active_master_role writer
<host default>
cluster_interface eno16777736
pid_path /run/mysql-mmm-agent.pid
bin_path /usr/libexec/mysql-mmm/
replication_user rep
replication_password password123
agent_user mmm_agent
agent_password password123
mysql_port 3309
</host>
<host mysql01>
ip 192.168.1.201
mode master
peer mysql02
</host>
<host mysql02>
ip 192.168.1.202
mode master
peer mysql01
</host>
<host slave1>
ip 192.168.1.247
mode slave
</host>
#<host slave2>
# ip 192.168.1.242
# mysql_port 3310
# mode slave
#</host>
<role writer>
hosts mysql01, mysql02
ips 192.168.1.200
mode exclusive
</role>
<role reader>
hosts mysql01, mysql02,slave1
ips 192.168.1.251, 192.168.1.252, 192.168.1.253
mode balanced
</role>
[root@salve1 mysql-mmm]# cat mmm_agent.conf
include mmm_common.conf
# The 'this' variable refers to this server. Proper operation requires
# that 'this' server (db1 by default), as well as all other servers, have the
# proper IP addresses set in mmm_common.conf.
this slave1
[root@salve1 mysql-mmm]#
#monitor上：
[root@mysql01 mysql-mmm]# cat mmm_mon.conf
include mmm_common.conf
<monitor>
ip 127.0.0.1
pid_path /run/mysql-mmm-monitor.pid
bin_path /usr/libexec/mysql-mmm
status_path /var/lib/mysql-mmm/mmm_mond.status
ping_ips 192.168.1.201,192.168.1.202,192.168.1.247
auto_set_online 60
# The kill_host_bin does not exist by default, though the monitor will
# throw a wning about it missing. See the section 5.10 "Kill Host
# Functionality" in the PDF documentation.
#
# kill_host_bin /usr/libexec/mysql-mmm/monitor/kill_host
#
</monitor>
<host default>
monitor_user mmm_monitor
monitor_password password123
</host>
debug 0
4.4 啓動monitor和agent
#monitor:
systemctl enable mysql-mmm-monitor.service #加入啓動項
systemctl start mysql-mmm-monitor.service #啓動monitor
#狀態：
[root@mysql01 mysql-mmm]# systemctl status mysql-mmm-monitor.service
* mysql-mmm-monitor.service - MySQL MMM Monitor
Loaded: loaded (/usr/lib/systemd/system/mysql-mmm-monitor.service; enabled; vendor preset: disabled)
Active: active (running) since 四 2020-01-30 19:52:04 CST; 21h ago
Process: 1464 ExecStart=/usr/sbin/mmm_mond (code=exited, status=0/SUCCESS)
Main PID: 2703 (mmm_mond)
CGroup: /system.slice/mysql-mmm-monitor.service
|-2703 mmm_mond
|-2704 mmm_mond
|-2848 perl /usr/libexec/mysql-mmm/monitor/checker ping_ip
|-2851 perl /usr/libexec/mysql-mmm/monitor/checker mysql
|-2853 perl /usr/libexec/mysql-mmm/monitor/checker ping
|-2855 perl /usr/libexec/mysql-mmm/monitor/checker rep_backlog
`-2858 perl /usr/libexec/mysql-mmm/monitor/checker rep_threads
1月 30 19:51:53 mysql01 systemd[1]: Starting MySQL MMM Monitor...
1月 30 19:52:04 mysql01 systemd[1]: Started MySQL MMM Monitor.
#mysql01(master1):
systemctl enable mysql-mmm-agent.service #加入啓動項
systemctl start mysql-mmm-agent.service #啓動mmm agent
#狀態：
[root@mysql01 mysql-mmm]# systemctl status mysql-mmm-agent.service
* mysql-mmm-agent.service - MySQL MMM agent
Loaded: loaded (/usr/lib/systemd/system/mysql-mmm-agent.service; enabled; vendor preset: disabled)
Active: active (running) since 四 2020-01-30 19:52:03 CST; 21h ago
Process: 1459 ExecStart=/usr/sbin/mmm_agentd (code=exited, status=0/SUCCESS)
Main PID: 2695 (mmm_agentd)
CGroup: /system.slice/mysql-mmm-agent.service
|-2695 mmm_agentd
`-2909 mmm_agentd
1月 30 19:51:53 mysql01 systemd[1]: Starting MySQL MMM agent...
1月 30 19:52:03 mysql01 systemd[1]: Started MySQL MMM agent.
1月 30 21:08:07 mysql01 systemd[1]: Started MySQL MMM agent.
[root@mysql01 mysql-mmm]#
#mysql02(master2):
systemctl enable mysql-mmm-agent.service #加入啓動項
systemctl start mysql-mmm-agent.service #啓動mmm agent
#狀態：
[root@mysql02 mysql-mmm]# systemctl status mysql-mmm-agent.service
* mysql-mmm-agent.service - MySQL MMM agent
Loaded: loaded (/usr/lib/systemd/system/mysql-mmm-agent.service; enabled; vendor preset: disabled)
Active: active (running) since 四 2020-01-30 19:52:03 CST; 21h ago
Process: 1459 ExecStart=/usr/sbin/mmm_agentd (code=exited, status=0/SUCCESS)
Main PID: 2695 (mmm_agentd)
CGroup: /system.slice/mysql-mmm-agent.service
|-2695 mmm_agentd
`-2909 mmm_agentd
1月 30 19:51:53 mysql02 systemd[1]: Starting MySQL MMM agent...
1月 30 19:52:03 mysql02 systemd[1]: Started MySQL MMM agent.
1月 30 21:08:07 mysql02 systemd[1]: Started MySQL MMM agent.
[root@mysql02 mysql-mmm]#
#slave：
systemctl enable mysql-mmm-agent.service #加入啓動項
systemctl start mysql-mmm-agent.service #啓動mmm agent
#狀態
[root@salve1 mysql-mmm]# systemctl status mysql-mmm-agent.service
[0m mysql-mmm-agent.service - MySQL MMM agent
Loaded: loaded (/usr/lib/systemd/system/mysql-mmm-agent.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2020-01-30 21:07:52 CST; 20h ago
Process: 5323 ExecStart=/usr/sbin/mmm_agentd (code=exited, status=0/SUCCESS)
Main PID: 5325 (mmm_agentd)
CGroup: /system.slice/mysql-mmm-agent.service
25 mmm_agentd
26 mmm_agentd
Jan 30 21:07:51 mysql01 systemd[1]: Starting MySQL MMM agent...
Jan 30 21:07:52 mysql01 systemd[1]: Started MySQL MMM agent.
[root@salve1 mysql-mmm]#
5 #查看MMM狀態：（monitor上）
[root@mysql01 mysql-mmm]# mmm_control --help
Invalid command '--help'
Valid commands are:
help - show this message
ping - ping monitor
show - show status
checks [<host>|all [<check>|all]] - show checks status
set_online <host> - set host <host> online
set_offline <host> - set host <host> offline
mode - print current mode.
set_active - switch into active mode.
set_manual - switch into manual mode.
set_passive - switch into passive mode.
move_role [--force] <role> <host> - move exclusive role <role> to host <host>
(Only use --force if you know what you are doing!)
set_ip <ip> <host> - set role with ip <ip> to host <host>
[root@mysql01 mysql-mmm]#
#show 狀態：
[root@mysql01 mysql-mmm]# mmm_control show mysql01(192.168.1.201) master/ONLINE. Roles: reader(192.168.1.251), writer(192.168.1.200) mysql02(192.168.1.202) master/ONLINE. Roles: reader(192.168.1.253) slave1(192.168.1.247) slave/ONLINE. Roles: reader(192.168.1.252)
#嘗試切換
#切換前檢查slave複製狀態：能夠看到這個時候的主庫是mysql01
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.201
Master_User: rep
Master_Port: 3309
Connect_Retry: 60
Master_Log_File: mysql-bin.000014
Read_Master_Log_Pos: 65754
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000014
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
#切換：
[root@mysql01 mysql-mmm]# mmm_control move_role writer mysql02 OK: Role 'writer' has been moved from 'mysql01' to 'mysql02'. Now you can wait some time and check new roles info! [root@mysql01 mysql-mmm]# [root@mysql01 mysql-mmm]# mmm_control show mysql01(192.168.1.201) master/ONLINE. Roles: reader(192.168.1.251) mysql02(192.168.1.202) master/ONLINE. Roles: reader(192.168.1.253), writer(192.168.1.200) slave1(192.168.1.247) slave/ONLINE. Roles: reader(192.168.1.252)
#能夠看到已經把writer角色切換到mysql02上
#檢查slave複製狀態，自動切換到mysql02上
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.202
Master_User: rep
Master_Port: 3309
Connect_Retry: 60
Master_Log_File: mysql-bin.000010
Read_Master_Log_Pos: 64494
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000010
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
###至此mysql mmm的簡單實驗完成，###開始犯了個錯誤，從庫也是用的GTID複製，這個時候會發現MMM切換角色的時候，從庫並不能自動切換主庫來同步。因此從庫必須用傳統複製。###這裏我並無啓用半同步。
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