技術標籤：錯誤解決

報錯資訊：Job for mysqld.service failed because the control process exited with error code. See “systemctl status mysqld.service” and “journalctl -xe” for details.

檢視日誌：cat /var/log/mysqld.log，尋找原因：

2020-12-15T01:38:38.906381Z 0 [Note] Skipping generation of SSL certificates as certificate files are present in
 
 data directory.
2020-12-15T01:38:38.907027Z 0 [Warning] CA certificate ca.pem is self signed.
2020-12-15T01:38:38.907065Z 0 [Note] Skipping generation of RSA key pair as key files are present in data directory.
2020-12-15T01:38:38.907384Z 0 [Note] Server hostname (bind-address): '*'; port: 3306
2020-12-15T01:38:38.907601Z 0
 
 [Note] IPv6 is available.
2020-12-15T01:38:38.907609Z 0 [Note]   - '::' resolves to '::';
2020-12-15T01:38:38.907621Z 0 [Note] Server socket created on IP: '::'.
2020-12-15T01:38:38.913473Z 0 [ERROR] Can't start server: can't check PID filepath: No such file or directory

錯誤原因：[ERROR] Can’t start server: can’t check PID filepath: No such file or directory，這是由於強制關機導致pid檔案丟失

解決方法

1、從mysql的配置檔案中查詢pid檔案路徑：

cat /etc/my.cnf

2、根據第一步路徑建立對應的目錄並修改許可權

mkdir -p /var/run/mysqld
chown mysql.mysql /var/run/mysqld

重啟mysql了，如果還不行繼續第三步

3、建立一個pid檔案並修改許可權

touch /var/run/mysqld/mysqld.pid
chown mysql.mysql /var/run/mysqld/mysqld.pid

再啟動MySQL。基本不會有問題了