1、如果主节点已经运行了一段时间，且有大量数据时，如何配置并启动slave节点（写出操作步骤）
主配置MySQL
[root@Centos8 ~]#yum -y install mariadb-server [root@Centos8 ~]#vim /etc/my.cnf.d/mariadb-server.cnf [mysqld] log_bin server-id=125 [root@Centos8 ~]#systemctl start mariadb [root@Centos8 ~]#mysql #创建复制账号 MariaDB [(none)]> grant replication slave on *.* to 'repluser'@'192.168.80.%' identified by 'heshizhe'; Query OK, 0 rows affected (0.000 sec) #备份数据库 [root@Centos8 ~]#mkdir /backup [root@Centos8 ~]#mysqldump -A -F --single-transaction --master-data=1 --default-character-set=utf8 > /backup/all.sql [root@Centos8 ~]#ll /backup/ total 468 -rw-r--r-- 1 root root 479022 Oct 12 19:16 all.sql
从MySQL配置
[root@Centos8-2 ~]#yum -y install mariadb-server #把备份文件复制到root目录下 [root@Centos8-2 ~]#scp 192.168.80.120:/backup/all.sql /root/ #将完全备份还原到新的从节点 [root@Centos8-2 ~]#vim /etc/my.cnf.d/mariadb-server.cnf [mysqld] server-id=121 read-only #从完全备份的位置之后开始复制 [root@Centos8-2 ~]#vim all.sql CHANGE MASTER TO MASTER_HOST='192.168.80.120', #主MySQL IP地址 MASTER_USER='repluser', #复制的账号 MASTER_PASSWORD='heshizhe', #密码 MASTER_LOG_FILE='mariadb-bin.000003', MASTER_LOG_POS=389; [root@Centos8-2 ~]#systemctl start mariadb [root@Centos8-2 ~]#mysql < all.sql [root@Centos8-2 ~]#mysql MariaDB [(none)]> start slave; #开启进程 MariaDB [(none)]> show slave status\G; #查看进程详细信息 *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.80.120 Master_User: repluser Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mariadb-bin.000003 Read_Master_Log_Pos: 516 Relay_Log_File: mariadb-relay-bin.000002 Relay_Log_Pos: 684 Relay_Master_Log_File: mariadb-bin.000003 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 516 Relay_Log_Space: 995 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 #复制延时 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 125 Master_SSL_Crl: Master_SSL_Crlpath: Using_Gtid: No Gtid_IO_Pos: Replicate_Do_Domain_Ids: Replicate_Ignore_Domain_Ids: Parallel_Mode: conservative SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it Slave_DDL_Groups: 1 Slave_Non_Transactional_Groups: 0 Slave_Transactional_Groups: 0 1 row in set (0.000 sec)
2、当master服务器宕机，提升一个slave成为新的master（写出操作步骤）
#找到哪个从节点的数据库是最新，让它成为新master [root@Centos8-2 ~]#cat /var/lib/mysql/relay-log.info 5 ./mariadb-relay-bin.000002 684 mariadb-bin.000003 516 0 #新master修改配置文件，关闭read-only配置 [root@Centos8-2 ~]#vim /etc/my.cnf.d/mariadb-server.cnf [mysqld] server-id=21 read-only=off log-bin [root@Centos8-2 ~]#systemctl restart mariadb.service #重启服务 #清除旧的master复制信息 MariaDB [(none)]> set global read_only=off; MariaDB [(none)]> stop slave; MariaDB [(none)]> reset slave all; #创建复制账号 MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO 'repluser'@'192.168.80.%' IDENTIFIED BY 'heshizhe'; #在新master上完全备份 [root@Centos8-2 ~]#mysqldump -A -F --single-transaction --master-data=1 --default-character-set=utf8 > /root/backup_`date +%F_%T`.sql [root@Centos8-2 ~]#ll total 480 -rw-r--r-- 1 root root 488111 Oct 3 17:12 backup_2020-10-03_17:12:16.sql #其它所有 slave 重新还原数据库，指向新的master [root@Centos8-3 ~]#scp 192.168.80.121:/root/backup_2020-10-03_17:12:16.sql /root/ [root@Centos8-2 ~]#vim backup_2020-10-03_17\:12\:16.sql CHANGE MASTER TO MASTER_HOST='192.168.80.121', #主MySQL IP地址 MASTER_USER='repluser', #复制的账号 MASTER_PASSWORD='heshizhe', #密码 MASTER_LOG_FILE='mariadb-bin.000003', MASTER_LOG_POS=375; MariaDB [mysql]> source /root/backup_2020-10-03_17:12:16.sql; MariaDB [mysql]> start slave; #试试有没有同步成功 MariaDB [(none)]> create database db2; #master MySQL MariaDB [mysql]> show databases; #slave MySQL +--------------------+ | Database | +--------------------+ | db1 | | db2 | | hellodb | | information_schema | | mysql | | performance_schema | +--------------------+ 6 rows in set (0.001 sec)
3、通过 MHA 0.58 搭建一个数据库集群结构
四台主机
192.168.80.125 centos7 MHA管理端
192.168.80.120 centos8 master
192.168.80.121 centos8 slave1
192.168.80.122 centos8 slave2
[root@MHA ~]#ssh-keygen #生成密钥 [root@MHA ~]#ssh-copy-id 192.168.80.125 #复制密钥到本机 [root@MHA ~]#rsync -a .ssh 192.168.80.120:/root #复制密钥给MySQL服务端 [root@MHA ~]#rsync -a .ssh 192.168.80.121:/root [root@MHA ~]#rsync -a .ssh 192.168.80.122:/root
在管理节点建立配置文件
[root@MHA ~]#yum -y install mha4mysql-node-0.58-0.el7.noarch.rpm mhamha4mysql-manager-0.58-0.el7.noarch.rpm [root@MHA ~]#mkdir /etc/mastermha/ [root@MHA ~]#vim /etc/mastermha/app1.cnf [server default] user=mhauser #用于远程连接MySQL所有节点的用户,需要有管理员的权限 password=heshizhe #用于远程连接MySQL所有节点的密码。 manager_workdir=/data/mastermha/app1/ #工作目录会自行生成不用手动创建 manager_log=/data/mastermha/app1/manager.log #日志保存位置 master_binlog_dir=/data/mysql-binglog/ #指定二进制日志存放的目录 remote_workdir=/data/mastermha/app1/ ssh_user=root #用于实现远程ssh基于KEY的连接,访问二进制日志 repl_user=repluser #主从复制的用户信息 repl_password=magedu ping_interval=1 #健康性检查的时间间隔 master_ip_failover_script=/usr/local/bin/master_ip_faliover #切换VIP的perl脚本 report_script=/usr/local/bin/sendmail.sh #当执行报警脚本 check_repl_delay=0 #默认如果slave中从库落后主库relaylog超过100M，主库不会选择这个从库为新的master，因为这个从库进行恢复需要很长的时间.通过这个参数，mha触发主从切换的时候会忽略复制的延时，通过check_repl_delay=0这个参数，mha触发主从切换时会忽略复制的延时，对于设置candidate_master=1的从库非常有用，这样确保这个从库一定能成为最新的master [server1] hostname=192.168.80.120 [server2] hostname=192.168.80.121 candidate_master=1 #设置为优先候选master，即使不是集群中事件最新的slave,也会优先当master [server3] hostname=192.168.80.122
[root@MHA ~]#vim /usr/local/bin/master_ip_faliover #切换VIP的perl脚本
#!/usr/bin/env perl
use strict;
use warnings FATAL => 'all';
use Getopt::Long;
my (
$command, $ssh_user, $orig_master_host, $orig_master_ip,
$orig_master_port, $new_master_host, $new_master_ip, $new_master_port
);
my $vip = '192.168.80.100/24'; #改成我们需要的vip
my $key = '1';
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
GetOptions(
'command=s' => \$command,
'ssh_user=s' => \$ssh_user,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'new_master_host=s' => \$new_master_host,
'new_master_ip=s' => \$new_master_ip,
'new_master_port=i' => \$new_master_port,
);
exit &main();
sub main {
print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";
if ( $command eq "stop" || $command eq "stopssh" ) {
my $exit_code = 1;
eval {
print "Disabling the VIP on old master: $orig_master_host \n";
&stop_vip();
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "start" ) {
my $exit_code = 10;
eval {
print "Enabling the VIP - $vip on the new master - $new_master_host \n";
&start_vip();
$exit_code = 0;
};
if ($@) {
warn $@;
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
print "Checking the Status of the script.. OK \n";
exit 0;
}
else {
&usage();
exit 1;
}
}
sub start_vip() {
`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
}
sub stop_vip() {
return 0 unless ($ssh_user);
`ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
}
sub usage {
print
"Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
}
[root@MHA ~]#chmod +x /usr/local/bin/master_ip_faliover
[root@MHA ~]#vim /usr/local/bin/sendmail.sh #邮箱报警脚本
echo "MySQL is down" | mail -s "MHA Warning" [email protected]
[root@MHA ~]#chmod +x /usr/local/bin/sendmail.sh
[root@master ~]#yum -y install mha4mysql-node-0.56-0.el6.noarch.rpm mariadb-server [root@master ~]#vim /etc/my.cnf.d/mariadb-server.cnf [mysqld] server-id=120 log_bin plugin-load-add = semisync_master #加载半同步复制插件 rpl_semi_sync_master_enabled=on #启动半同步复制插件 rpl_semi_sync_master_timeout=3000 #3秒内无法同步，也将返回成功信息给客户端 [root@master ~]#systemctl start mariadb [root@master ~]#mysql MariaDB [(none)]> show master logs; +--------------------+-----------+ | Log_name | File_size | +--------------------+-----------+ | mariadb-bin.000001 | 28198 | | mariadb-bin.000002 | 344 | +--------------------+-----------+ 2 rows in set (0.000 sec) #创建MHA用于远程连接MySQL所有节点的用户 MariaDB [(none)]> grant all on *.* to 'mhauser'@'192.168.80.%' identified by 'heshizhe'; #创建主从复制授权用户 MariaDB [(none)]> grant replication slave on *.* to 'repluser'@'192.168.80.%' identified by 'heshizhe'; [root@master ~]#ifconfig eth0:1 192.168.80.100/24 #配置VIP地址
[root@slave1 ~]#yum -y install mariadb-server mha4mysql-node-0.58-0.el7.noarch.rpm [root@slave1 ~]#vim /etc/my.cnf.d/mariadb-server.cnf [mysqld] server-id=121 read_only log_bin plugin_load_add = semisync_slave rpl_semi_sync_slave_enabled=on skip_name_resolve=1 #禁止反向解析 [root@slave1 ~]#systemctl start mariadb [root@slave1 ~]#mysql MariaDB [(none)]> CHANGE MASTER TO -> MASTER_HOST='192.168.80.120', -> MASTER_USER='repluser', -> MASTER_PASSWORD='heshizhe', -> MASTER_PORT=3306, -> MASTER_LOG_FILE='mariadb-bin.000002', -> MASTER_LOG_POS=344; Query OK, 0 rows affected (0.025 sec) MariaDB [(none)]> start slave; Query OK, 0 rows affected (0.004 sec)
[root@slave1 ~]#yum -y install mariadb-server mha4mysql-node-0.58-0.el7.noarch.rpm [root@slave1 ~]#vim /etc/my.cnf.d/mariadb-server.cnf [mysqld] server-id=122 read_only log_bin plugin_load_add = semisync_slave rpl_semi_sync_slave_enabled=on skip_name_resolve=1 #禁止反向解析 [root@slave1 ~]#systemctl start mariadb [root@slave1 ~]#mysql MariaDB [(none)]> CHANGE MASTER TO -> MASTER_HOST='192.168.80.120', -> MASTER_USER='repluser', -> MASTER_PASSWORD='heshizhe', -> MASTER_PORT=3306, -> MASTER_LOG_FILE='mariadb-bin.000002', -> MASTER_LOG_POS=344; Query OK, 0 rows affected (0.025 sec) MariaDB [(none)]> start slave; Query OK, 0 rows affected (0.004 sec)
#检查环境 [root@mha ~]#masterha_check_ssh --conf=/etc/mastermha/app1.cnf [root@mha ~]#masterha_check_repl --conf=/etc/mastermha/app1.cnf #查看状态 [root@mha ~]#masterha_check_status --conf=/etc/mastermha/app1.cnf
#开启MHA,默认是前台运行 [root@MHA ~]#nohup masterha_manager --conf=/etc/mastermha/app1.cnf &> /dev/null #查看状态 [root@MHA ~]#masterha_check_status --conf=/etc/mastermha/app1.cnf app1 (pid:3093) is running(0:PING_OK), master:192.168.80.120
[root@MHA ~]#tail -f /data/mastermha/manager.log
检测到原主已经宕机
原来的主masert 192.168.80.120已经宕机了，提升192.168.80.121为新主
4、实战案例：Percona XtraDB Cluster(PXC 5.7）
环境准备
三台主机
192.168.80.125 pxc1
192.168.80.126 pxc2
192.168.80.127 pxc3
关闭防火墙和SELinux，保证时间同步
注意：如果已经安装MySQL，必须卸载
#此处使用清华大学yum源，官方源太慢了 [root@pxc1 ~]#vim /etc/yum.repos.d/pxc.repo [percona] name=percona_repo baseurl = https://mirrors.tuna.tsinghua.edu.cn/percona/release/$releasever/RPMS/$basearch enabled = 1 gpgcheck = 0 [root@pxc1 ~]#scp /etc/yum.repos.d/pxc.repo 192.168.80.126:/etc/yum.repos.d/ [root@pxc1 ~]#scp /etc/yum.repos.d/pxc.repo 192.168.80.127:/etc/yum.repos.d/ #在三个节点都安装好PXC 5.7 [root@pxc1 ~]#yum install Percona-XtraDB-Cluster-57 -y [root@pxc2 ~]#yum install Percona-XtraDB-Cluster-57 -y [root@pxc3 ~]#yum install Percona-XtraDB-Cluster-57 -y
在各个节点上分别配置mysql及集群配置文件
#第一个节点 [root@pxc1 ~]#vim /etc/percona-xtradb-cluster.conf.d/mysqld.cnf [mysqld] server-id=125 [root@pxc1 ~]#vim /etc/percona-xtradb-cluster.conf.d/wsrep.cnf [root@pxc1 ~]#grep -Ev "^#|^$" /etc/percona-xtradb-cluster.conf.d/wsrep.cnf [mysqld] wsrep_provider=/usr/lib64/galera3/libgalera_smm.so wsrep_cluster_address=gcomm://192.168.80.125,192.168.80.126,192.168.80.127 binlog_format=ROW default_storage_engine=InnoDB wsrep_slave_threads= 8 wsrep_log_conflicts innodb_autoinc_lock_mode=2 wsrep_node_address=192.168.80.125 wsrep_cluster_name=pxc-cluster wsrep_node_name=pxc-cluster-node-125 pxc_strict_mode=ENFORCING wsrep_sst_method=xtrabackup-v2 wsrep_sst_auth="sstuser:123456789" #第二个节点 [root@pxc2 ~]#vim /etc/percona-xtradb-cluster.conf.d/mysqld.cnf [mysqld] server-id=126 [root@pxc2 ~]#vim /etc/percona-xtradb-cluster.conf.d/wsrep.cnf [root@pxc2 ~]#grep -Ev "^#|^$" /etc/percona-xtradb-cluster.conf.d/wsrep.cnf [mysqld] wsrep_provider=/usr/lib64/galera3/libgalera_smm.so wsrep_cluster_address=gcomm://192.168.80.125,192.168.80.126,192.168.80.127 binlog_format=ROW default_storage_engine=InnoDB wsrep_slave_threads= 8 wsrep_log_conflicts innodb_autoinc_lock_mode=2 wsrep_node_address=192.168.80.126 wsrep_cluster_name=pxc-cluster wsrep_node_name=pxc-cluster-node-126 pxc_strict_mode=ENFORCING wsrep_sst_method=xtrabackup-v2 wsrep_sst_auth="sstuser:123465789" #第三个节点 [root@pxc3 ~]#vim /etc/percona-xtradb-cluster.conf.d/mysqld.cnf [mysqld] server-id=127 [root@pxc3 ~]#vim /etc/percona-xtradb-cluster.conf.d/wsrep.cnf [root@pxc3 ~]#grep -Ev "^#|^$" /etc/percona-xtradb-cluster.conf.d/wsrep.cnf [mysqld] wsrep_provider=/usr/lib64/galera3/libgalera_smm.so wsrep_cluster_address=gcomm://192.168.80.125,192.168.80.126,192.168.80.127 binlog_format=ROW default_storage_engine=InnoDB wsrep_slave_threads= 8 wsrep_log_conflicts innodb_autoinc_lock_mode=2 wsrep_node_address=192.168.80.127 wsrep_cluster_name=pxc-cluster wsrep_node_name=pxc-cluster-node-127 pxc_strict_mode=ENFORCING wsrep_sst_method=xtrabackup-v2 wsrep_sst_auth="sstuser:123456789"
root@pxc1 ~]#systemctl start [email protected] #启动服务 [root@pxc1 ~]#ss -ntlu Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port udp UNCONN 0 0 127.0.0.1:323 *:* udp UNCONN 0 0 [::1]:323 [::]:* tcp LISTEN 0 128 *:4567 *:* tcp LISTEN 0 100 127.0.0.1:25 *:* tcp LISTEN 0 128 *:22 *:* tcp LISTEN 0 100 [::1]:25 [::]:* tcp LISTEN 0 80 [::]:3306 [::]:* tcp LISTEN 0 128 [::]:22 [::]:* #取出数据库临时密码 [root@centos7 ~]#awk '/root@/{print $NF}' /var/log/mysqld.log tb!56)WOKde- [root@pcx1 ~]#mysql -uroot -p'tb!56)WOKde-' #登入数据库 mysql> alter user 'root'@'localhost' identified by '123456789'; #更改数据密码 #创建相关用户并授权 mysql> create user 'sstuser'@'locatlhost' identified by '123456789'; Query OK, 0 rows affected (0.00 sec) mysql> grant reload,lock tables , process,replication client on *.* to 'root'@'localhost'; Query OK, 0 rows affected (0.01 sec) mysql> show status like 'wsrep%'; +----------------------------------+--------------------------------------+ | Variable_name | Value | +----------------------------------+--------------------------------------+ | wsrep_local_state_uuid | d12ab403-0fa7-11eb-b8db-4a1add9f3294 | | ....... | ..... | | wsrep_local_state | 4 | | wsrep_local_state_comment | Synced | | ..... | ...... | | wsrep_cluster_size | 1 | | wsrep_cluster_status | Primary | | wsrep_connected | ON | | wsrep_local_bf_aborts | 0 | | .... | ...... | | wsrep_ready | ON | +----------------------------------+--------------------------------------+ 71 rows in set (0.01 sec)
[root@pxc2 ~]#systemctl start mysql.service [root@pxc2 ~]#ss -ntl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:4567 *:* LISTEN 0 100 127.0.0.1:25 *:* LISTEN 0 128 *:22 *:* LISTEN 0 100 [::1]:25 [::]:* LISTEN 0 80 [::]:3306 [::]:* LISTEN 0 128 [::]:22 [::]:* #第三个节点也一样，MySQL密码已经自动同步为123456了。
5、通过 ansible 部署二进制 mysql 8.0
[root@centos7-4 ~]#ssh-keygen
[root@centos7-4 ~]#ssh-copy-id 192.168.80.128
[root@centos7-4 ~]#rsync -a .ssh 192.168.80.120:/root
[root@centos7-4 ~]#rsync -a .ssh 192.168.80.121:/root
[root@centos7-4 ~]#ll
total 473736
-rw-r--r-- 1 root root 210 Oct 18 12:07 fuzhi.yaml
-rw-r--r-- 1 root root 1455 Oct 18 16:49 install_mysql.yaml
-rw-r--r-- 1 root root 297 Oct 18 11:53 my.cnf
-rw-r--r-- 1 root root 485074552 Oct 18 11:52 mysql-8.0.19-linux-glibc2.12-x86_64.tar.xz
-rw-r--r-- 1 root root 117 Oct 17 17:38 mysql_backup.sh
-rwxr-xr-x 1 root root 118 Oct 18 15:37 mysql_pass.sh
-rw-r--r-- 1 root root 45 Oct 18 15:00 mysql.sh
-rw-r--r-- 1 root root 365 Oct 18 16:27 mysql.yaml
[root@centos7-4 ~]#cat my.cnf
[mysqld]
datadir=/data/mysql #指定数据库目录
socket=/data/mysql/mysql.sock #套接字文件
skip_name_resolve=1 #禁止域名解析
log-error=/data/mysql/mysql.log #日志文件位置
pid-file=/data/mysql/mysql.pid #记录当前 mysqld 进程的 pid
[client]
socket=/data/mysql/mysql.sock
[root@centos7-4 ~]#cat mysql_pass.sh
#!/bin/bash
mysqladmin -uroot -p`awk '/A temporary password/{print $NF}' /data/mysql/mysql.log` password heshizhe
[root@centos7-4 ~]#cat install_mysql.yaml
---
- hosts: dbserver
remote_user: root
gather_facts: no
tasks:
- name: 安装相关软件
yum: name=libaio,numactl-libs
- name: 创建MySQL用户组
group: name=mysql gid=306 system=yes
- name: 创建MySQL用户
user: name=mysql uid=306 home=/data/mysql group=mysql shell=/sbin/nologin system=yes create_home=no
- name: 解压数据库到远程主机
unarchive: src=/root/mysql-8.0.19-linux-glibc2.12-x86_64.tar.xz dest=/usr/local owner=mysql group=mysql
- name: 创建软链接
file: src=/usr/local/mysql-8.0.19-linux-glibc2.12-x86_64 dest=/usr/local/mysql state=link
- name: 复制配置文件
copy: src=/root/my.cnf dest=/etc/my.cnf owner=mysql group=mysql
- name: 配置环境变量
copy: content='PATH=/usr/local/mysql/bin:$PATH' dest=/etc/profile.d/mysql.sh
- name: 运行环境变量
shell: source /etc/profile.d/mysql.sh
- name: 复制启动文件
shell: /usr/bin/cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
- name: 初始化数据库
shell: /usr/local/mysql/bin/mysqld --initialize --user=mysql --datadir=/data/mysql
- name: 启动数据库
shell: chkconfig --add mysqld; systemctl start mysqld
- name: 复制取出临时密码脚本到远程主机
copy: src=/root/mysql_pass.sh dest=/root/mysql_pass.sh mode=755
- name: 更改数据库密码
shell: bash /root/mysql_pass.sh
[root@centos7-4 ~]#cat /etc/ansible/hosts
[webserver]
192.168.80.120
192.168.80.121
[appserver]
192.168.80.122
192.168.80.120
[dbserver]
192.168.80.121
192.168.80.120
[root@centos7-4 ~]#ansible-playbook install_mysql.yaml