昨天重啟完NAS後，今天早上發現NAS又死機了。只能再次強制關機，重啟。
啟動docker容器之前，我把mysql容器的記憶體調整了一下，調整成了512M。然後就悲劇的發現啟動不了了。後來發現，啟動不了不是我調記憶體的關係。
查看日誌，顯示如下:
2020-12-27T02:43:53.375776Z 0 mysqld: [Warning] World-writable config file '/etc/mysql/my.cnf' is ignored.
2020-12-27T02:43:53.375776Z 0 mysqld: Error on realpath() on '/var/lib/mysql-files' (Error 2 - No such file 或 directory)
2020-12020 -27T02:43:53.375776Z 0 [ERROR] [MY-010095] [Server] Failed to access directory for --secure-file-priv. Please make sure that directory exists and is essible upplival acc / /lib/mysql-files
2020-12-27T02:43:53.376005Z 0 [ERROR] [MY-010119] [Server] Aborting
#百度了下，解決方法是重新run一個mysql容器，並且在先前的配置上加上-v /mnt/md0/User/wzp/home/www/mysql-files:/var/lib/mysql-files/。
現在問題來了，之前run mysql容器時，我並沒有記錄完整的run 指令。還好，透過rekcod工具可以查看。更喜的是，這個工具可以透過docker來運作。因為我的NAS的系統不是發行版的linux，npm，yum好多工具都沒辦法安裝。
關於rekcod的使用可以參考linuxea:如何復現查看docker run參數指令
簡單來說，用法如下：
1 docker 安裝rekcod
$ docker pull nexdrew/rekcod $ alias rekcod="docker run --rm -v /var/run/docker.sock:/var/run/docker.sock nexdrew/rekcod"
2 使用方法：
[root@TNAS-012664 ~]# rekcod mysql ==>mysql是我的容器名 docker run --name mysql --runtime runc -v /mnt/md0/User/wzp/home/www/mysql/:/var/lib/mysql -p 3306:3306/tcp --net bridge --restart no -h 39964e9e508a --expose 3306/tcp --expose 33060/tcp -e 'MYSQL_ROOT_PASSWORD=123456' -e 'PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin' -e 'GOSU_VERSION=1.12' -e 'MYSQL_MAJOR=5.7' -e 'MYSQL_VERSION=5.7.30-1debian10' -d -t -i --entrypoint "docker-entrypoint.sh" mysql 'mysqld'
可以看到我的資料庫檔案都是放在/mnt/md0/User/wzp/home/www/mysql/目錄下，我查看了下該目錄文件，資料應該是沒有遺失的。
於是，我新建了mysql2 容器，指令如下docker run -d -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 --name mysql2 -v /mnt/md0/User/wzp /home/www/mysql/:/var/lib/mysql -v /mnt/md0/User/wzp/home/www/mysql-files:/var/lib/mysql-files/ mysql
然後，進入mysql2，發現沒辦法連接資料庫
##docker exec -it mysql2 /bin/bash
root@0e83698acbfb:/# mysqld status mysqld: [Warning] World-writable config file '/etc/mysql/conf.d/docker.cnf' is ignored. mysqld: [Warning] World-writable config file '/etc/mysql/conf.d/mysql.cnf' is ignored. 2020-12-27T02:39:41.865252Z 0 [Warning] [MY-011070] [Server] 'Disabling symbolic links using --skip-symbolic-links (or equivalent) is the default. Consider not using this option as it' is deprecated and will be removed in a future release. 2020-12-27T02:39:41.865455Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.20) starting as process 105 2020-12-27T02:39:41.871715Z 0 [ERROR] [MY-010123] [Server] Fatal error: Please read "Security" section of the manual to find out how to run mysqld as root! 2020-12-27T02:39:41.872541Z 0 [ERROR] [MY-010119] [Server] Aborting 2020-12-27T02:39:41.872776Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.20) MySQL Community Server - GPL. root@0e83698acbfb:/# Fatal error: Please read "Security" section of the manual to find out how to run mysqld as root!^C用以下方法以root方式啟動mysqld
root@0e83698acbfb:/# mysqld --user=root mysqld: [Warning] World-writable config file '/etc/mysql/conf.d/docker.cnf' is ignored. mysqld: [Warning] World-writable config file '/etc/mysql/conf.d/mysql.cnf' is ignored. 2020-12-27T02:40:57.169719Z 0 [Warning] [MY-011070] [Server] 'Disabling symbolic links using --skip-symbolic-links (or equivalent) is the default. Consider not using this option as it' is deprecated and will be removed in a future release. 2020-12-27T02:40:57.169896Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.20) starting as process 116 2020-12-27T02:40:57.184807Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started. 2020-12-27T02:40:57.241048Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock ./ibdata1 error: 11 2020-12-27T02:40:58.241783Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock ./ibdata1 error: 11 2020-12-27T02:40:59.242983Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock ./ibdata1 error: 11 2020-12-27T02:41:00.244290Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock ./ibdata1 error: 11 2020-12-27T02:41:01.245762Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock ./ibdata1 error: 11 2020-12-27T02:41:02.247539Z 1 [ERROR] [MY-012574] [InnoDB] Unable to lock ./ibdata1 error: 11螢幕一直印出Unable to lock ./ibdata1 error: 11，只能CTRL-C強制中斷。百度了下，有兩個方式來解決該問題1 參考mysql之[ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
這篇文章分析，導致該error主要是以下兩個原因，很可惜，文章中的方法並不能解決我的問題。
2 參考mysqld報InnoDB: Unable to lock ./ibdata1 error: 11這篇文章完美解決了我的問題。主要進行了以下操作。 2.1 首先，進入我的mysql資料庫所在目錄磁碟空間目錄不足
- ibdata1 檔案被其他的進程佔用
cd /mnt/md0/User/wzp/home/www/mysql##2.2 然後將ibdata1等檔案重命名後，再cp回來。具體為什麼要這麼做，我也不太明白。
[root@TNAS-012664 www]# cd /mnt/md0/User/wzp/home/www/mysql/ [root@TNAS-012664 mysql]# ls auto.cnf binlog.index client-key.pem dci '#ib_16384_0.dblwr' ib_logfile0 mautic nianbao performance_schema robot shangbiao undo_001 zeng baike ca-key.pem company_works dianzicaipiao '#ib_16384_1.dblwr' ib_logfile1 mysql niuwan private_key.pem sara_wiki sjzt_ry6 undo_002 bigdatapaltfrom ca.pem copyrightdata gs_data ib_buffer_pool '#innodb_temp' mysql.ibd pachong public_key.pem server-cert.pem sys wenshu binlog.000001 client-cert.pem db_huayun hy_dci_admin ibdata1 integrate mysql_upgrade_info pachong2 qianliu_wiki server-key.pem ucenter_huayunyy yuanqixiaoshuo [root@TNAS-012664 mysql]# mv ibdata1 ibdata1.bak [root@TNAS-012664 mysql]# mv ib_logfile0 ib_logfile0.bak [root@TNAS-012664 mysql]# mv ib_logfile1 ib_logfile1.bak [root@TNAS-012664 mysql]# cp -a ibdata1.bak ibdata1 [root@TNAS-012664 mysql]# cp -a ib_logfile0.bak ib_logfile0 [root@TNAS-012664 mysql]# cp -a ib_logfile1.bak ib_logfile1
2.3 然後我刪除之前的mysql2 container，用下面的指令再一次run一個mysql2容器，發現就可以連接mysql資料庫了。
[root@TNAS-012664 ~]# docker run -d -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 --name mysql2 -v /mnt/md0/User/wzp/home/www/mysql/:/var/lib/mysql -v /mnt/md0/User/wzp/home/www/mysql-files:/var/lib/mysql-files/ mysql 1e031247ea46e82f6205db68e7fb1b55389c87e5e2cb13517f9e1ac17d514509 [root@TNAS-012664 ~]# docker exec -it mysql2 /bin/bash root@1e031247ea46:/# mysql -uroot -p mysql: [Warning] World-writable config file '/etc/mysql/my.cnf' is ignored. Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 8.0.20 MySQL Community Server - GPL Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show databases;以為mysql容器好了就萬事大吉了？ No，too naive! 還有一個小插曲等著我。這邊剛好把mysql容器解決好，突然又發現我的wiki容器莫名其妙沒了。不過好在，資料庫檔案在，一切還能恢復如初。
1 用以下的指令新建兩個wiki
docker run --name sarawiki --link mysql2:mysql -p 8086:80 -d sarawang85/mediawiki:1.0.0 docker run --name qianliuwiki --link mysql2:mysql -p 8083:80 -d sarawang85/mediawiki:1.0.0
2 然後把備份好的LocalSettings.php 檔案和Logo圖片copy 進容器，搞定。
PS，如果在docker gui介面編輯stop狀態的容器，例如設定記憶體限制，實際上會新建一個同名的容器。因為我發現我這樣做了後，訪問我的wiki，又提示我重新安裝。
再次PS，mysql 備份得立即提上行程。 mysql 記憶體限制不能單單通過容器來限制，my.cnf也得做回應更改。
推薦學習：《
