按照 mysql 官网的 yum 安装说明给刚初始化的 centos7 系统装,mysql 无法启动,求教.

[Newyorkcity]

服务器是刚刚初始化磁盘之后的 centos7 的阿里云服务器.
所有的步骤都按照官网的安装教程:
https://dev.mysql.com/doc/mysql-repo-excerpt/5.6/en/linux-installation-yum-repo.html

错误出在第四步启动 mysql 服务器 之前我感觉应该都 OK

[root@Adam mysql]# sudo service mysqld start
Redirecting to /bin/systemctl start  mysqld.service

[root@Adam mysql]# sudo service mysqld status
Redirecting to /bin/systemctl status  mysqld.service
mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled)
   Active: active (running) since Thu 2018-05-03 14:48:47 CST; 19min ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 1180 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
  Process: 1107 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 1184 (mysqld)
   CGroup: /system.slice/mysqld.service
           └─1184 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysql...

May 03 14:48:47 Adam systemd[1]: Started MySQL Server.
May 03 15:06:53 Adam systemd[1]: Started MySQL Server.

查看错误日志

cat /var/log/mysqld.log

得到:

2018-05-03T06:48:40.433045Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-05-03T06:48:42.653691Z 0 [Warning] InnoDB: New log files created, LSN=45790
2018-05-03T06:48:42.987991Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2018-05-03T06:48:43.053417Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 0500bdb0-4e9e-11e8-a47e-00163e08240e.
2018-05-03T06:48:43.055498Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2018-05-03T06:48:43.055946Z 1 [Note] A temporary password is generated for root@localhost: *wGve+dHu1Y(
2018-05-03T06:48:46.745567Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-05-03T06:48:46.747041Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.22) starting as process 1184 ...
2018-05-03T06:48:46.750539Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-05-03T06:48:46.750562Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-05-03T06:48:46.750570Z 0 [Note] InnoDB: Uses event mutexes
2018-05-03T06:48:46.750574Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-05-03T06:48:46.750578Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.3
2018-05-03T06:48:46.750581Z 0 [Note] InnoDB: Using Linux native AIO
2018-05-03T06:48:46.750849Z 0 [Note] InnoDB: Number of pools: 1
2018-05-03T06:48:46.751127Z 0 [Note] InnoDB: Using CPU crc32 instructions
2018-05-03T06:48:46.752547Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-05-03T06:48:46.763777Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-05-03T06:48:46.766286Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-05-03T06:48:46.778460Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-05-03T06:48:46.788598Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-05-03T06:48:46.788640Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-05-03T06:48:46.994265Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-05-03T06:48:46.995082Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2018-05-03T06:48:46.995093Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2018-05-03T06:48:46.996046Z 0 [Note] InnoDB: Waiting for purge to start
2018-05-03T06:48:47.046201Z 0 [Note] InnoDB: 5.7.22 started; log sequence number 2589318
2018-05-03T06:48:47.046511Z 0 [Note] Plugin 'FEDERATED' is disabled.
2018-05-03T06:48:47.051515Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2018-05-03T06:48:47.054110Z 0 [Note] InnoDB: Buffer pool(s) load completed at 180503 14:48:47
2018-05-03T06:48:47.055609Z 0 [Note] Found ca.pem, server-cert.pem and server-key.pem in data directory. Trying to enable SSL support using them.
2018-05-03T06:48:47.055818Z 0 [Warning] CA certificate ca.pem is self signed.
2018-05-03T06:48:47.057502Z 0 [Note] Server hostname (bind-address): '*'; port: 3306
2018-05-03T06:48:47.057539Z 0 [Note] IPv6 is available.
2018-05-03T06:48:47.057549Z 0 [Note]   - '::' resolves to '::';
2018-05-03T06:48:47.057570Z 0 [Note] Server socket created on IP: '::'.
2018-05-03T06:48:47.066966Z 0 [Note] Event Scheduler: Loaded 0 events
2018-05-03T06:48:47.067077Z 0 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.7.22'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server (GPL)

linux 系统真是折腾..按照官网的方法安装还总是会遇上毛病 另外想问一句能解决这个问题的前辈...你们是怎么修炼到这个程度的? 谢谢

[zocome]

这有什么错误？不是告诉了你 Active: active (running) 么

[Newyorkcity]

@zocome 额?
官方的范例说第一句的回应应该是 Starting mysqld:[ OK ]
第二局的回应应该是 mysqld (pid 3066) is running.
我看到这么大块代码就自然而然地觉得是失败了....
如果是成功了为何我的输出如此与众不同...

[zocome]

centos7 的 systemd 了解一下

[jasonyang9]

CentOS 7 用 systemd 来管服务了，而且 mysqld 也是跑起来的

[zocome]

官方说什么你就只看什么是吧，人家文档也没跟你说是用的 centos7
看官方文档命令用的可能是 centos6 或者其他发行版

[jasonyang9]

```
systemctl start mysqld
systemctl enable mysqld
systemctl status mysqld
```

https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-centos-7

[Newyorkcity]

@zocome
@jasonyang9
可我已经用 yum 安装 mysql5.7 安装了一大半了...要全部推倒重新来过?

[jasonyang9]

@Newyorkcity #7 不用啊，mysqld 已经跑起来了，并在监听 3306 端口