記一次mysql宕機

e_warning: pdo::prepare(): mysql server has gone away: pdo::prepare(): mysql server has gone away

illuminate\database\queryexception:sqlstate[hy000] [2002] connection refused (sql: select * from `***` )

今早發現mysql宕機,並且沒有任何異常記錄,日誌表現為執行 shutdown 命令,但shutdown完成後沒有重新啟動.

檢視案發時間是:2018-04-24t07:04:42

檢視/var/log/目錄下所有日誌

檢視各種系統日誌都沒有發現與案發時間相吻合的記錄

最終在 /var/log/alternatives.log 發現如下日誌:

update-alternatives 2018-04-24 07:04:40: run with --install /etc/mysql/my.cnf my.cnf /etc/mysql/my.cnf.fallback 100

update-alternatives 2018-04-24 07:04:53: run with --install /etc/mysql/my.cnf my.cnf /etc/mysql/mysql.cnf 200

柳暗花明,接著檢視這是誰的日誌,通過google找到 (**)

/var/log/alternatives.log – information by the update-alternatives are logged into this log file. on ubuntu, update-alternatives maintains symbolic links determining default commands.

這是軟體的更新記錄

然後檢視apt更新日誌 (/var/log/apt/history.log)

start-date: 2018-04-24 07:04:36 commandline: /usr/bin/unattended-upgrade upgrade: mysql-client-5.7:amd64 (5.7.21-0ubuntu0.16.04.1, 5.7.22-0ubuntu0.16.04.1), mysql-server-5.7:amd64 (5.7.21-0ubuntu0.16.04.1, 5.7.22-0ubuntu0.16.04.1), mysql-client-core-5.7:amd64 (5.7.21-0ubuntu0.16.04.1, 5.7.22-0ubuntu0.16.04.1), mysql-common:amd64 (5.7.21-0ubuntu0.16.04.1, 5.7.22-0ubuntu0.16.04.1), mysql-server-core-5.7:amd64 (5.7.21-0ubuntu0.16.04.1, 5.7.22-0ubuntu0.16.04.1) error: sub-process /usr/bin/dpkg returned an error code (1)

end-date: 2018-04-24 07:04:53

發現的確是因為apt的自動更新導致的mysql shutdown

解決方法:

1,關閉自動更新(參考文章:

2,手工啟動mysql

記一次mysql宕機

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