一键构建GreatSQL5.7.36-single-master模式MGR集群

Posted 2022-04-18 运维之美

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开场白：整点心灵毒鸡汤
三十岁一切オ刚刚开始
下班路上想了很久，一眨眼自己已经不是20几岁了，我的青春结束了，我们都低估了时间的善变，轻易让原本浓烈的东西不见了。
生活的琐碎，吐出来矫情，吞下去呛。
百般滋味涌上心头，话到嘴边却不值一提，词穷不是沉默更多的是一言难尽。
非常喜欢一段话：现在的我，用执着烧死了所有的幼稚和任性，那片荒野慢慢长处了理智冷漠和清醒。共勉！

闲话短说，让咱们进入本期博文正题

一、准备环境

服务器环境：
centos7.9 x86_64位阿里ECS最小化安装
ECS服务器本地hosts文件

tidb04 mgr01
tidb05 mgr02
tidb06 mgr03

阿里云安全组或者iptables防火墙要提前放行33061端口 (MGR内部通信端口)
演示实现结果：
一键脚本初始化和安装完成greatsql版mysql5.7.36-39 单主模式三个节点的MGR集群，(最多支持9个节点的MGR集群)

演示ansible脚本来源：
参考 GreatSQL官方版 mysql8.0.25 ansible 一键完成单主模式MGR集群
greatsql官方ansible地址如下
https://gitee.com/GreatSQL/GreatSQL-Doc/blob/master/docs/install-greatsql-with-ansible.md

二、开始部署

2.1、mgr01到mgr01,mgr02,mgr03 实现ssh免密钥登陆

mgr01服务器作为ansible脚本执行端：
需要在 MGR01服务器上安装ansible软件和 ssh免密钥到 MGR01 MGR02 MGR03

安装命令： yum install -y ansible
验证ansible: ansible --version

配置ansible:
修改 /etc/ansible/hosts 文件，把要安装GreatSQL的服务器IP加进去

[root@tidb04 greatsql]# cat /etc/ansible/hosts
[greatsql_dbs:children]
greatsql_mgr_primary
greatsql_mgr_secondary
greatsql_mgr_arbitrator

[greatsql_mgr_primary]
192.168.0.59
[greatsql_mgr_secondary]
192.168.0.246
[greatsql_mgr_arbitrator]
192.168.0.247

提示：
请填内网IP地址，因为MGR初始化时，默认使用用内网IP地址。所以，如果同时还要安装到本机，也请填写内网IP地址
上面这个主机列表，分为三个组，一个是选择作为MGR PRIMARY节点的组 greatsql_mgr_primary，只有一个主机。另一组选择作为SECONDARY节点 greatsql_mgr_secondary，有1个主机。greatsql_mgr_arbitrator 代表仲裁节点，有一个主机。
当然这三个组也可以再次合并到一起。成为一个新的组 greatsql_dbs。
当然也可以去掉冲裁组greatsql_mgr_arbitrator，按照下面的方式配置ansible hosts文件也是OK的

[root@tidb04 greatsql]# cat /etc/ansible/hosts
[greatsql_dbs:children]
greatsql_mgr_primary
greatsql_mgr_secondary

[greatsql_mgr_primary]
192.168.0.59
192.168.0.246

配置SSH免密钥，具体过程大家百度自查，此处不在演示

测试ansible：
随意执行一个指令，测试ansibile可连接远程主机

[root@tidb04 greatsql]# ansible greatsql_dbs -a "uptime"
192.168.0.59 | CHANGED | rc=0 >>
 12:28:44 up 162 days, 22:41,  5 users,  load average: 0.24, 0.11, 0.12
192.168.0.246 | CHANGED | rc=0 >>
 12:28:44 up 24 days, 17 min,  2 users,  load average: 0.02, 0.03, 0.05
192.168.0.247 | CHANGED | rc=0 >>
 12:28:44 up 35 days, 21:58,  2 users,  load average: 0.08, 0.07, 0.12

这就表示可以正常运行了。

2.2、使用ansible自动安装GreatSQL

A、第一步，修改 /etc/hosts 设置正确的主机名

修改三台个服务器上的 /etc/hosts 文件，加入正确的主机名配置：

[root@tidb04 greatsql]# grep mgr /etc/hosts
192.168.0.59 mgr01
192.168.0.246 mgr02
192.168.0.247 mgr03

B、第二步， git clone greatsql-8.0.27的ansible脚本

https://gitee.com/GreatSQL/GreatSQL-Ansible.git
修改脚本内容包括：安装包版本，安装路径，MGR初始化参数，greatsql-5.7.36的初始化脚本和启动脚本等。修改完成后cp 到mgr01服务器 /opt/greatsql 目录下

下载GreatSQL-5.7.36-39-Linux-glibc2.17-x86_64.tar.xz 二进制安装包到 /opt/greatsql/ 下

[root@tidb04 greatsql]# ll /opt/greatsql/
total 330100
-rw-r--r-- 1 root root       333 Apr 10 12:42 check_mysql.yml
-rw-r--r-- 1 root root 337980016 Apr  7 10:57 GreatSQL-5.7.36-39-Linux-glibc2.17-x86_64.tar.xz
-rw-r--r-- 1 root root      7561 Apr 12 08:44 greatsql.yml
-rw-r--r-- 1 root root      9592 Apr 10 12:42 LICENSE
drwxr-xr-x 3 root root      4096 Apr 12 08:50 mysql-support-files
-rw-r--r-- 1 root root       882 Apr 10 12:42 README.en.md
-rw-r--r-- 1 root root       811 Apr 10 12:42 README.md
-rw-r--r-- 1 root root       377 Apr 12 08:13 vars.yml

再次说明：以上安装脚本基于Greatsql8.0.27一键安装脚本改写完成

2.3、ansible脚本文件内容

greatsql.yml 文件是ansible安装剧本文件内容：


[root@tidb04 greatsql]# cat /opt/greatsql/greatsql.yml 
- name: install GreatSQL
  hosts: greatsql_dbs
  remote_user: root
  ignore_errors: yes
  vars_files: 
    - vars.yml

  tasks:
    - include: check_mysql.yml

    - block:
       - name: modify selinux config file
         lineinfile: dest=/etc/selinux/config regexp=SELINUX=enforcing line=SELINUX=disabled backrefs=yes state=present

       - name: stop firewalld
         command: /usr/bin/systemctl stop firewalld.service

       - name: disable firewalld
         command: /usr/bin/systemctl disable firewalld.service

       - name: install jemalloc jemalloc-devel
         raw: yum install -y jemalloc jemalloc-devel

       - name: add group mysql
         group: name=mysql_user state=present

       - name: add user mysql
         user: name=mysql_user group=mysql_user shell=/sbin/nologin

       - name: create data_dir
         file: path=data_dir/data state=directory owner=mysql_user group=mysql_user mode=0700
       - name: create binlog_dir
         file: path=data_dir/binlog state=directory owner=mysql_user group=mysql_user mode=0700
       - name: create logs_dir
         file: path=data_dir/logs state=directory owner=mysql_user group=mysql_user mode=0700
       - name: extract GreatSQL tarball
         unarchive: src=work_dir/file_name dest=extract_dir mode=755

       - name: backup /etc/my.cnf
         copy: src=my_cnf dest=my_cnf.orig ignore_errors=True

       - name: copy my.cnf
         copy: src=work_dir/mysql-support-files/my.cnf dest=my_cnf owner=mysql_user group=mysql_user mode=0644

       - name: copy mysqld_pre_systemd
         copy: src=work_dir/mysql-support-files/mysqld_pre_systemd dest=base_dir/bin/ owner=mysql_user group=mysql_user mode=0755
      # - name: copy mysqld
      #   copy: src=work_dir/mysql-support-files/mysqld dest=base_dir/bin/ owner=mysql_user group=mysql_user mode=0755
      # - name: copy mysql
      #   copy: src=work_dir/mysql-support-files/mysql dest=base_dir/bin/ owner=mysql_user group=mysql_user mode=0755

       - name: replace mysqld_pre_systemd MYSQL_BASEDIR
         replace:
           path: "base_dir/bin/mysqld_pre_systemd"
           regexp: (MYSQL_BASEDIR)=.*
           replace: \\1=base_dir

       - name: replace my.cnf server_id settings
         replace:
           path: " my_cnf "
           regexp: (.*server_id.*)=.*
           replace: \\1= 3306 1024 | random

       - name: replace my.cnf group_replication_local_address settings
         replace:
           path: " my_cnf "
           regexp: (.*group_replication_local_address.*)=.*
           replace: \\1=  inventory_hostname :33061

       - name: replace my.cnf group_replication_group_seeds settings
         replace:
           path: " my_cnf "
           regexp: (.*group_replication_group_seeds.*)=.*
           replace: \\1=  mgr_seeds 

       - name: replace my.cnf report_host settings
         replace:
           path: " my_cnf "
           regexp: (.*report_host.*)=.*
           replace: \\1=  inventory_hostname 

       - name: copy sysconfig/mysql to /etc/sysconfig/mysql
         copy: src=work_dir/mysql-support-files/sysconfig/mysql dest=/etc/sysconfig owner=root group=root mode=0644

       - name: preload jemalloc
         command: /usr/sbin/ldconfig

       - name: copy mysql PATH
         copy: src=work_dir/mysql-support-files/mysql.sh dest=/etc/profile.d/mysql.sh

       - name: copy greatsql.server
         copy: src=work_dir/mysql-support-files/greatsql.service dest=/usr/lib/systemd/system/ owner=root group=root mode=0644

       - name: reload GreatSQL service
         command: /usr/bin/systemctl daemon-reload

      when: check_mysql_port.stdout == "True" and check_mysql_ps.stdout == "True"

- name: mgr primary
  hosts: greatsql_mgr_primary
  ignore_errors: yes
  vars_files:
    - vars.yml
  tasks:
     - include: check_mysql.yml

     - block:
        - name: start the GreatSQL service on PRIMARY NODE
          command: /usr/bin/systemctl start greatsql

        - name: wait for mysqld start
          shell: sleep  wait_for_start 
          delay: 1

        - name: mgr primary init
          shell: > 
                 base_dir /bin/mysql -uroot -f -S  data_dir /mysql.sock
                -ANse "SET @@SESSION.SQL_LOG_BIN=0;
                CREATE USER IF NOT EXISTS  mgr_user  IDENTIFIED WITH mysql_native_password BY  mgr_user_pwd ;
                GRANT REPLICATION SLAVE ON *.* TO  mgr_user ;
                CHANGE MASTER TO MASTER_USER= mgr_user , MASTER_PASSWORD= mgr_user_pwd  FOR CHANNEL group_replication_recovery;
                SET GLOBAL group_replication_local_address =  inventory_hostname :33061;
                SET GLOBAL group_replication_group_seeds =  mgr_seeds ;
                SET GLOBAL group_replication_bootstrap_group=ON;
                START GROUP_REPLICATION;
                SET GLOBAL group_replication_bootstrap_group=OFF; "

       when: check_mysql_port.stdout == "True" and check_mysql_ps.stdout == "True"

- name: mgr secondary
  hosts: greatsql_mgr_secondary
  ignore_errors: yes
  vars_files:
    - vars.yml
  tasks:
     - include: check_mysql.yml

     - block:
        - name: start the GreatSQL service on SECONDARY NODE
          command: /usr/bin/systemctl start greatsql

        - name: wait for mysqld start
          shell: sleep  wait_for_start 
          delay: 1

        - name: mgr secondary init
          shell: >
                 base_dir /bin/mysql -uroot -f -S  data_dir /mysql.sock
                -ANse "SET @@SESSION.SQL_LOG_BIN=0;
                CREATE USER IF NOT EXISTS  mgr_user  IDENTIFIED WITH mysql_native_password BY  mgr_user_pwd ;
                GRANT REPLICATION SLAVE ON *.* TO  mgr_user ;
                CHANGE MASTER TO MASTER_USER= mgr_user , MASTER_PASSWORD= mgr_user_pwd  FOR CHANNEL group_replication_recovery;
                SET GLOBAL group_replication_local_address =  inventory_hostname :33061;
                SET GLOBAL group_replication_group_seeds =  mgr_seeds ;
                START GROUP_REPLICATION; "

       when: check_mysql_port.stdout == "True" and check_mysql_ps.stdout == "True"

- name: mgr arbitrator
  hosts: greatsql_mgr_arbitrator
  ignore_errors: yes
  vars_files:
    - vars.yml
  tasks:
     - include: check_mysql.yml

     - block:
        - name: replace my.cnf arbitrator settings
          replace:
            path: " my_cnf "
            regexp: (.*_arbitrator.*)=.*
            replace: \\1= 1

        - name: start the GreatSQL service on ARBITRATOR NODE
          command: /usr/bin/systemctl start greatsql

        - name: wait for mysqld start
          shell: sleep  wait_for_start 
          delay: 1

        - name: mgr arbitrator init
          shell: >
                 base_dir /bin/mysql -uroot -f -S  data_dir /mysql.sock
                -ANse "SET @@SESSION.SQL_LOG_BIN=0;
                CREATE USER IF NOT EXISTS  mgr_user  IDENTIFIED WITH mysql_native_password BY  mgr_user_pwd ;
                GRANT REPLICATION SLAVE ON *.* TO  mgr_user ;
                CHANGE MASTER TO MASTER_USER= mgr_user , MASTER_PASSWORD= mgr_user_pwd  FOR CHANNEL group_replication_recovery;
                SET GLOBAL group_replication_local_address =  inventory_hostname :33061;
                SET GLOBAL group_replication_group_seeds =  mgr_seeds ;
                START GROUP_REPLICATION; "

       when: check_mysql_port.stdout == "True" and check_mysql_ps.stdout == "True"
[root@tidb04 greatsql]#

2.4、mysqld_pre_systemd脚本

这个是数据库初始化脚本中，下面展示的是初始化mysql这块的函数：数据目录有改动改成了/data/GreatSQL/data


[root@tidb04 mysql-support-files]# grep -wA 60 install_db () mysqld_pre_systemd 
install_db () 
    # Note: something different than datadir=/var/lib/mysql requires SELinux policy changes (in enforcing mode)

    # mysql_upgrade_info file should be owned by mysql user since MySQL 8.0.16
    fix_mysql_upgrade_info

    # No automatic init wanted
    [ -e /etc/sysconfig/mysql ] && . /etc/sysconfig/mysql
    [ -n "$NO_INIT" ] && exit 0

    local instance=$1
    datadir=$(get_option mysqld datadir "/data/GreatSQL/data$instance:+-$instance" $instance)
    log=$(get_option mysqld log[_-]error "/data/GreatSQL/$instance:+-$instance.log" $instance)

    # Restore log, dir, perms and SELinux contexts

    if [ ! -d "$datadir" -a ! -h "$datadir" -a "x$(dirname "$datadir")" = "x/var/lib" ]; then
    install -d -m 0751 -omysql -gmysql "$datadir" || exit 1
    fi

    if [ ! -e "$log" -a ! -h "$log" -a x$(dirname "$log") = "x/var/log" ]; then
    case $(basename "$log") in
        mysql*.log) install /dev/null -m0640 -omysql -gmysql "$log" ;;
        *) ;;
    esac
    fi

    if [ -x /usr/sbin/restorecon ]; then
        /usr/sbin/restorecon "$datadir"
        [ -e "$log" ] && /usr/sbin/restorecon "$log"
    for dir in /var/lib/mysql-files /var/lib/mysql-keyring ; do
            if [ -x /usr/sbin/semanage -a -d /var/lib/mysql -a -d $dir ] ; then
                /usr/sbin/semanage fcontext -a -e /var/lib/mysql $dir >/dev/null 2>&1
                /sbin/restorecon -r $dir
            fi
    done
    fi

    # If special mysql dir is in place, skip db install
    [ -d "$datadir/mysql" ] && exit 0

    # Create initial db and install validate_password plugin
    #initfile="$(install_validate_password_sql_file)"
    $MYSQL_BASEDIR/bin/mysqld $instance:+--defaults-group-suffix=@$instance --initialize-insecure \\
             --datadir="$datadir" --user=mysql
    #rm -f "$initfile"

    # Generate certs if needed
    if [ -x $MYSQL_BASEDIR/bin/mysql_ssl_rsa_setup -a ! -e "$datadir/server-key.pem" ] ; then
        $MYSQL_BASEDIR/bin/mysql_ssl_rsa_setup --datadir="$datadir" --uid=mysql >/dev/null 2>&1
    fi
    exit 0


install_db $1

exit 0

2.5、greatsql.service 这个文件是初始化mysql 和启动MySQL脚本

这个文件是初始化mysql 和启动MySQL脚本内容和greatsql官方的稍微不同
```html/xml
[root@tidb04 mysql-support-files]# cat greatsql.service
[Unit]
Description=GreatSQL Server
Documentation=man:mysqld(8)
Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html
After=network.target
After=syslog.target
[Install]
WantedBy=multi-user.target

[Service]
User=mysql
Group=mysql
Type=forking
TimeoutSec=0
PermissionsStartOnly=true
ExecStartPre=/usr/local/GreatSQL-5.7.36-39-Linux-glibc2.17-x86_64/bin/mysqld_pre_systemd
ExecStart=/usr/local/GreatSQL-5.7.36-39-Linux-glibc2.17-x86_64/bin/mysqld --defaults-file=/etc/my.cnf --daemonize

EnvironmentFile=-/etc/sysconfig/mysql
LimitNOFILE = 65535
Restart=on-failure
RestartSec=20
RestartPreventExitStatus=1
PrivateTmp=false

### 2.6、vars.yml 是ansible安装脚本中定义的环境变量
```html/xml
[root@tidb04 greatsql]# cat vars.yml 
work_dir: /opt/greatsql
extract_dir: /usr/local
data_dir: /data/GreatSQL
file_name: GreatSQL-5.7.36-39-Linux-glibc2.17-x86_64.tar.xz
base_dir: /usr/local/GreatSQL-5.7.36-39-Linux-glibc2.17-x86_64
my_cnf: /etc/my.cnf
mysql_user: mysql
mysql_port: 3306
mgr_user: repl
mgr_user_pwd: repl4MGR
mgr_seeds: 192.168.0.59:33061,192.168.0.246:33061,192.168.0.247:33061
wait_for_start: 30

2.7、整个脚本正常的安装过程输出

```html/xml
[root@tidb04 greatsql]# ansible-playbook ./greatsql.yml

PLAY [install GreatSQL] ****

TASK [Gathering Facts] *****
ok: [192.168.0.59]
ok: [192.168.0.246]
ok: [192.168.0.247]

TASK [check mysql port] ****
changed: [192.168.0.247]
changed: [192.168.0.59]
changed: [192.168.0.246]

TASK [check mysql processor] ***
changed: [192.168.0.246]
changed: [192.168.0.59]
changed: [192.168.0.247]

TASK [modify selinux config file] **
ok: [192.168.0.247]
ok: [192.168.0.59]
ok: [192.168.0.246]

TASK [stop firewalld] **
changed: [192.168.0.59]
changed: [192.168.0.246]
changed: [192.168.0.247]

TASK [disable firewalld] ***
changed: [192.168.0.59]
changed: [192.168.0.247]
changed: [192.168.0.246]

TASK [install jemalloc jemalloc-devel] *****
changed: [192.168.0.59]
changed: [192.168.0.246]
changed: [192.168.0.247]

TASK [add group mysql] *****
ok: [192.168.0.246]
ok: [192.168.0.59]
ok: [192.168.0.247]

TASK [add user mysql] **
ok: [192.168.0.59]
ok: [192.168.0.246]
ok: [192.168.0.247]

TASK [create data_dir] *****
changed: [192.168.0.247]
changed: [192.168.0.59]
changed: [192.168.0.246]

TASK [create binlog_dir] ***
changed: [192.168.0.59]
changed: [192.168.0.247]
changed: [192.168.0.246]

TASK [create logs_dir] *****
changed: [192.168.0.59]
changed: [192.168.0.246]
changed: [192.168.0.247]

TASK [extract GreatSQL tarball] ****
changed: [192.168.0.247]
changed: [192.168.0.59]
changed: [192.168.0.246]

TASK [backup /etc/my.cnf] **
fatal: [192.168.0.246]: FAILED! => "changed": false, "checksum": "0d659e26a7f136ba3764b8a097d8d601e4d4fbd4", "msg": "Unsupported parameters for (copy) module: ignore_errors Supported parameters include: _original_basename, attributes, backup, checksum, content, delimiter, dest, directory_mode, follow, force, group, local_follow, mode, owner, regexp, remote_src, selevel, serole, setype, seuser, src, unsafe_writes, validate"
...ignoring
fatal: [192.168.0.59]: FAILED! => "changed": false, "checksum": "0d659e26a7f136ba3764b8a097d8d601e4d4fbd4", "msg": "Unsupported parameters for (copy) module: ignore_errors Supported parameters include: _original_basename, attributes, backup, checksum, content, delimiter, dest, directory_mode, follow, force, group, local_follow, mode, owner, regexp, remote_src, selevel, serole, setype, seuser, src, unsafe_writes, validate"
...ignoring
fatal: [192.168.0.247]: FAILED! => "changed": false, "checksum": "0d659e26a7f136ba3764b8a097d8d601e4d4fbd4", "msg": "Unsupported parameters for (copy) module: ignore_errors Supported parameters include: _original_basename, attributes, backup, checksum, content, delimiter, dest, directory_mode, follow, force, group, local_follow, mode, owner, regexp, remote_src, selevel, serole, setype, seuser, src, unsafe_writes, validate"
...ignoring

TASK [copy my.cnf] *****
changed: [192.168.0.59]
changed: [192.168.0.247]
changed: [192.168.0.246]

TASK [copy mysqld_pre_systemd] *****
changed: [192.168.0.59]
changed: [192.168.0.247]
changed: [192.168.0.246]

TASK [replace mysqld_pre_systemd MYSQL_BASEDIR] ****
ok: [192.168.0.59]
ok: [192.168.0.247]
ok: [192.168.0.246]

TASK [replace my.cnf server_id settings] ***
changed: [192.168.0.246]
changed: [192.168.0.59]
changed: [192.168.0.247]

TASK [replace my.cnf group_replication_local_address settings] *****
changed: [192.168.0.59]
changed: [192.168.0.247]
changed: [192.168.0.246]

TASK [replace my.cnf group_replication_group_seeds settings] ***
changed: [192.168.0.59]
changed: [192.168.0.247]
changed: [192.168.0.246]

TASK [replace my.cnf report_host settings] *****
changed: [192.168.0.246]
changed: [192.168.0.59]
changed: [192.168.0.247]

TASK [copy sysconfig/mysql to /etc/sysconfig/mysql] ****
ok: [192.168.0.246]
ok: [192.168.0.59]
ok: [192.168.0.247]

TASK [preload jemalloc] ****
changed: [192.168.0.59]
changed: [192.168.0.247]
changed: [192.168.0.246]

TASK [copy mysql PATH] *****
ok: [192.168.0.246]
ok: [192.168.0.59]
ok: [192.168.0.247]

TASK [copy greatsql.server] ****
ok: [192.168.0.59]
ok: [192.168.0.246]
ok: [192.168.0.247]

TASK [reload GreatSQL service] *****
changed: [192.168.0.246]
changed: [192.168.0.59]
changed: [192.168.0.247]

PLAY [mgr primary] *****

TASK [Gathering Facts] *****
ok: [192.168.0.59]

TASK [check mysql port] ****
changed: [192.168.0.59]

TASK [check mysql processor] ***
changed: [192.168.0.59]

TASK [start the GreatSQL service on PRIMARY NODE] **
changed: [192.168.0.59]

TASK [wait for mysqld start] ***
changed: [192.168.0.59]

TASK [mgr primary init] ****
changed: [192.168.0.59]

PLAY [mgr secondary] ***

TASK [Gathering Facts] *****
ok: [192.168.0.246]

TASK [check mysql port] ****
changed: [192.168.0.246]

TASK [check mysql processor] ***
changed: [192.168.0.246]

TASK [start the GreatSQL service on SECONDARY NODE] ****
changed: [192.168.0.246]

TASK [wait for mysqld start] ***
changed: [192.168.0.246]

TASK [mgr secondary init] **
changed: [192.168.0.246]

PLAY [mgr arbitrator] **

TASK [Gathering Facts] *****
ok: [192.168.0.247]

TASK [check mysql port] ****
changed: [192.168.0.247]

TASK [check mysql processor] ***
changed: [192.168.0.247]

TASK [replace my.cnf arbitrator settings] **
ok: [192.168.0.247]

TASK [start the GreatSQL service on ARBITRATOR NODE] ***
changed: [192.168.0.247]

TASK [wait for mysqld start] ***
changed: [192.168.0.247]

TASK [mgr arbitrator init] *****
changed: [192.168.0.247]

PLAY RECAP *****
192.168.0.246 : ok=32 changed=22 unreachable=0 failed=0 skipped=0 rescued=0 ignored=1
192.168.0.247 : ok=33 changed=22 unreachable=0 failed=0 skipped=0 rescued=0 ignored=1
192.168.0.59 : ok=32 changed=22 unreachable=0 failed=0 skipped=0 rescued=0 ignored=1

### 2.8、验证安装结果

## 三、遇到的问题

**登陆过程遇到的问题：**

[root@tidb04 GreatSQL]# /usr/local/GreatSQL-5.7.36-39-Linux-glibc2.17-x86_64/bin/mysql -uroot
/usr/local/GreatSQL-5.7.36-39-Linux-glibc2.17-x86_64/bin/mysql: error while loading shared libraries: libreadline.so: cannot open shared object file: No such file or directory


**解决办法:**

yum install readline-devel readline-devel



写在最后的话：greatsql 开源版MGR 修复了好多MySQL官方MGR的bug问题。和官方MySQL MGR相比 性能和数据安全上提升非常大，而且greatsql社区非常活跃，再次力荐大家采用greatsql 的MGR产品。
下面是greatsql官方地址：https://gitee.com/GreatSQL/GreatSQL 。资料还是非常详细的.

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