MySQL / MariaDB 在恰好 1 分 42 秒后关闭
MySQL / MariaDB shuts down after exactly 1 minute 42 seconds
我已经在 macOS Sierra 上通过 VirtualBox 和 Vagrant 安装了 Homestead。一切正常，除了一些神秘的原因 MySQL 在盒子启动超过 1 分 42 秒后自行关闭...
我可以在前 1 分 42 秒内毫无问题地使用 MySQL，但随后服务突然关闭并拒绝进一步连接。
我在服务器启动后 tailed /var/log/syslog，出现以下系统日志条目：
Dec 10 20:02:25 homestead systemd[1]: mariadb.service: Start operation timed out. Terminating.
Dec 10 20:02:25 homestead mysqld[1611]: 2016-12-10 20:02:25 140574075632384 [Note] /usr/sbin/mysqld: Normal shutdown
Dec 10 20:02:25 homestead mysqld[1611]: 2016-12-10 20:02:25 140574075632384 [Note] Event Scheduler: Purging the queue. 0 events
Dec 10 20:02:25 homestead kernel: [ 100.520787] audit_printk_skb: 15 callbacks suppressed
Dec 10 20:02:25 homestead kernel: [ 100.520844] audit: type=1400 audit(1481400145.309:17): apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/mysqld" name="run/systemd/notify" pid=1611 comm="mysqld" requested_mask="w" denied_mask="w" fsuid=113 ouid=0
Dec 10 20:02:25 homestead mysqld[1611]: 2016-12-10 20:02:25 140573193234176 [Note] InnoDB: FTS optimize thread exiting.
Dec 10 20:02:25 homestead mysqld[1611]: 2016-12-10 20:02:25 140574075632384 [Note] InnoDB: Starting shutdown...
Dec 10 20:02:25 homestead systemd[1]: Started Session 4 of user vagrant.
Dec 10 20:02:26 homestead mysqld[1611]: 2016-12-10 20:02:26 140574075632384 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
Dec 10 20:02:27 homestead mysqld[1611]: 2016-12-10 20:02:27 140574075632384 [Note] InnoDB: Shutdown completed; log sequence number 1355249813
Dec 10 20:02:27 homestead mysqld[1611]: 2016-12-10 20:02:27 140574075632384 [Note] /usr/sbin/mysqld: Shutdown complete
Dec 10 20:02:27 homestead kernel: [ 102.937893] audit: type=1400 audit(1481400147.726:18): apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/mysqld" name="run/systemd/notify" pid=2030 comm="mysqld" requested_mask="w" denied_mask="w" fsuid=113 ouid=0
Dec 10 20:02:27 homestead kernel: [ 102.938561] audit: type=1400 audit(1481400147.726:19): apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/mysqld" name="run/systemd/notify" pid=1611 comm="mysqld" requested_mask="w" denied_mask="w" fsuid=113 ouid=0
Dec 10 20:02:27 homestead systemd[1]: Failed to start MariaDB database server.
Dec 10 20:02:27 homestead systemd[1]: mariadb.service: Unit entered failed state.
Dec 10 20:02:27 homestead systemd[1]: mariadb.service: Failed with result 'timeout'.
Dec 10 20:02:27 homestead systemd[1]: Reached target Multi-User System.
Dec 10 20:02:27 homestead systemd[1]: Starting Notify bootloader that boot was successful...
Dec 10 20:02:27 homestead systemd[1]: Reached target Graphical Interface.
Dec 10 20:02:27 homestead systemd[1]: Starting Update UTMP about System Runlevel Changes...
Dec 10 20:02:27 homestead systemd[1]: Started Update UTMP about System Runlevel Changes.
Dec 10 20:02:27 homestead snap[2063]: Ignoring 'booted' on classic
Dec 10 20:02:27 homestead systemd[1]: Started Notify bootloader that boot was successful.
Dec 10 20:02:27 homestead systemd[1]: Startup finished in 5.989s (kernel) + 1min 36.860s (userspace) = 1min 42.850s.
第一行，写着 mariadb.service，在我被踢出 MySQL 的那一刻被记录下来。但是我不知道为什么。
看起来日志暗示 MySQL/MariaDB 仍在尝试在框被打开后启动 - 尽管此时我已经能够毫无问题地连接到它们。然后遇到了一些神秘的超时，整个事情都关闭了。
谁能帮我解释一下...？谢谢！
终于弄明白了 - AppArmor 似乎是导致问题的原因。
following the steps outlined here，我解决了这个问题，MySQL 不再意外关闭。
我已经在 macOS Sierra 上通过 VirtualBox 和 Vagrant 安装了 Homestead。一切正常，除了一些神秘的原因 MySQL 在盒子启动超过 1 分 42 秒后自行关闭...
我可以在前 1 分 42 秒内毫无问题地使用 MySQL，但随后服务突然关闭并拒绝进一步连接。
我在服务器启动后 tailed /var/log/syslog，出现以下系统日志条目：
Dec 10 20:02:25 homestead systemd[1]: mariadb.service: Start operation timed out. Terminating.
Dec 10 20:02:25 homestead mysqld[1611]: 2016-12-10 20:02:25 140574075632384 [Note] /usr/sbin/mysqld: Normal shutdown
Dec 10 20:02:25 homestead mysqld[1611]: 2016-12-10 20:02:25 140574075632384 [Note] Event Scheduler: Purging the queue. 0 events
Dec 10 20:02:25 homestead kernel: [ 100.520787] audit_printk_skb: 15 callbacks suppressed
Dec 10 20:02:25 homestead kernel: [ 100.520844] audit: type=1400 audit(1481400145.309:17): apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/mysqld" name="run/systemd/notify" pid=1611 comm="mysqld" requested_mask="w" denied_mask="w" fsuid=113 ouid=0
Dec 10 20:02:25 homestead mysqld[1611]: 2016-12-10 20:02:25 140573193234176 [Note] InnoDB: FTS optimize thread exiting.
Dec 10 20:02:25 homestead mysqld[1611]: 2016-12-10 20:02:25 140574075632384 [Note] InnoDB: Starting shutdown...
Dec 10 20:02:25 homestead systemd[1]: Started Session 4 of user vagrant.
Dec 10 20:02:26 homestead mysqld[1611]: 2016-12-10 20:02:26 140574075632384 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
Dec 10 20:02:27 homestead mysqld[1611]: 2016-12-10 20:02:27 140574075632384 [Note] InnoDB: Shutdown completed; log sequence number 1355249813
Dec 10 20:02:27 homestead mysqld[1611]: 2016-12-10 20:02:27 140574075632384 [Note] /usr/sbin/mysqld: Shutdown complete
Dec 10 20:02:27 homestead kernel: [ 102.937893] audit: type=1400 audit(1481400147.726:18): apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/mysqld" name="run/systemd/notify" pid=2030 comm="mysqld" requested_mask="w" denied_mask="w" fsuid=113 ouid=0
Dec 10 20:02:27 homestead kernel: [ 102.938561] audit: type=1400 audit(1481400147.726:19): apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/mysqld" name="run/systemd/notify" pid=1611 comm="mysqld" requested_mask="w" denied_mask="w" fsuid=113 ouid=0
Dec 10 20:02:27 homestead systemd[1]: Failed to start MariaDB database server.
Dec 10 20:02:27 homestead systemd[1]: mariadb.service: Unit entered failed state.
Dec 10 20:02:27 homestead systemd[1]: mariadb.service: Failed with result 'timeout'.
Dec 10 20:02:27 homestead systemd[1]: Reached target Multi-User System.
Dec 10 20:02:27 homestead systemd[1]: Starting Notify bootloader that boot was successful...
Dec 10 20:02:27 homestead systemd[1]: Reached target Graphical Interface.
Dec 10 20:02:27 homestead systemd[1]: Starting Update UTMP about System Runlevel Changes...
Dec 10 20:02:27 homestead systemd[1]: Started Update UTMP about System Runlevel Changes.
Dec 10 20:02:27 homestead snap[2063]: Ignoring 'booted' on classic
Dec 10 20:02:27 homestead systemd[1]: Started Notify bootloader that boot was successful.
Dec 10 20:02:27 homestead systemd[1]: Startup finished in 5.989s (kernel) + 1min 36.860s (userspace) = 1min 42.850s.
第一行，写着 mariadb.service，在我被踢出 MySQL 的那一刻被记录下来。但是我不知道为什么。
看起来日志暗示 MySQL/MariaDB 仍在尝试在框被打开后启动 - 尽管此时我已经能够毫无问题地连接到它们。然后遇到了一些神秘的超时，整个事情都关闭了。
谁能帮我解释一下...？谢谢！
终于弄明白了 - AppArmor 似乎是导致问题的原因。
following the steps outlined here，我解决了这个问题，MySQL 不再意外关闭。