由于AppArmor，MySQL无法启动？

我正在尝试在Kubuntu 16.04上安装mysql-server-5.7，但是遇到了麻烦。

sudo apt install mysql-server 给出以下输出。

Setting up mysql-server-5.7 (5.7.18-0ubuntu0.16.04.1) ...
Renaming removed key_buffer and myisam-recover options (if present)
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
invoke-rc.d: initscript mysql, action "start" failed.
● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: exit-code) since ons 2017-05-17 09:48:39 CEST; 10ms ago
  Process: 13622 ExecStartPost=/usr/share/mysql/mysql-systemd-start post (code=exited, status=0/SUCCESS)
  Process: 13621 ExecStart=/usr/sbin/mysqld (code=exited, status=2)
  Process: 13612 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
 Main PID: 13621 (code=exited, status=2)

maj 17 09:48:39 anis systemd[1]: Failed to start MySQL Community Server.
maj 17 09:48:39 anis systemd[1]: mysql.service: Unit entered failed state.
maj 17 09:48:39 anis systemd[1]: mysql.service: Failed with result 'exit-code'.
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.7; however:
  Package mysql-server-5.7 is not configured yet.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 mysql-server-5.7
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)

当尝试通过运行进行故障排除时，journalctl -xe我得到如下输出，这似乎表明AppArmor给我带来了麻烦。

maj 17 09:53:14 anis systemd[1]: Starting MySQL Community Server...
-- Subject: Unit mysql.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has begun starting up.
maj 17 09:53:14 anis audit[14767]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/14767/status" pid=14767 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=124 ouid=124
maj 17 09:53:14 anis audit[14767]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=14767 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=124 ouid=0
maj 17 09:53:14 anis kernel: audit: type=1400 audit(1495007594.314:240): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/14767/status" pid=14767 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=124 ouid=124
maj 17 09:53:14 anis kernel: audit: type=1400 audit(1495007594.314:241): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=14767 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=124 ouid=0
maj 17 09:53:14 anis kernel: audit: type=1400 audit(1495007594.314:242): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/14767/status" pid=14767 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=124 ouid=124
maj 17 09:53:14 anis audit[14767]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/14767/status" pid=14767 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=124 ouid=124
maj 17 09:53:14 anis audit[14767]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/14767/task/14767/mem" pid=14767 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=124 ouid=124
maj 17 09:53:14 anis kernel: audit: type=1400 audit(1495007594.658:243): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/14767/task/14767/mem" pid=14767 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=124 ouid=124
maj 17 09:53:14 anis systemd[1]: mysql.service: Main process exited, code=exited, status=2/INVALIDARGUMENT

我该如何解决这个问题？

您需要编辑您的apparmor配置，以便MySQL访问那些文件。日志消息告诉你，/usr/sbin/mysqld需要阅读（r）访问开放/proc/14767/status，/sys/devices/system/node/（斜线因为它要读取目录），和/proc/14767/task/14767/mem。要编辑的文件是/etc/apparmor.d/usr.sbin.mysqld。

就我而言，我通过在中间的某处（每行前面有两个空格）添加这些行来解决了这个问题：

  /proc/*/status r,
  /sys/devices/system/node/ r,
  /sys/devices/system/node/node0/meminfo r,

（请注意第二行的斜杠。）

之后，尝试启动MySQL，如果遇到更多错误，也添加这些文件，然后重试。

这是我在其他地方对这个问题的回答。

可能是这样的：https： //bugs.debian.org/cgi-bin/bugreport.cgi？bug = 739846， 所以请尝试使用

echo "exit 0" >> /etc/init.d/mysql
dpkg --configure -a

如果它不能帮助使用：

sudo apt-get purge mysql-server mysql-client mysql-common mysql-server-5.5
sudo apt-get install mysql-server

完全删除mysql并重新安装警告：如果您有任何数据库，它们将被删除。

我以此解决了这个问题；

编辑/etc/apparmor.d/local/usr.sbin.mysqld

添加这些行；

/data/ r,
/data/** rwk,

重新装甲服务

#sudo service apparmor reload

在我的情况下，尝试使用上述答案后在Ubuntu 16.04上安装mysql-server-5.7的工作原理是：

1. 跑 sudo apt install mysql-server
2. 检查以上确切错误
3. 重启
4. sudo apt install mysql-server再次运行以继续安装

安装完成。

1. stop mysql-server
2. rm /var/lib/mysql/ib_logfile*
3. restart mysql