線上的有一個c的程序，讀了mariadb的數據就core，查了下，我們用了mysql_ping命令，在執行的時候在mariadb的內部core了，用dmesg看了下內核信息，最終定位可能的原因是Mysql的版本問題，所以本次需要將我們用的Mariadb的版本升級到最新，并且測試下是否有問題，頁就是一次升級過程。

一 查看OS版本和數據庫版本

#mysql

MariaDB [(none)]> select version();

+----------------+

| version() |

+----------------+

| 10.3.7-MariaDB |

操作系統版本：

[root@localhost ~]# lsb_release -a

LSB Version: :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch

Distributor ID: CentOS

Description: CentOS Linux release 7.6.1810 (Core)

Release: 7.6.1810

Codename: Core

二 下載升級

2.1 下載

wget http://ftp.bme.hu/pub/mirrors/mariadb//mariadb-10.4.11/bintar-linux-x86_64/mariadb-10.4.11-linux-x86_64.tar.gz

停止老的mariadb:

service mysqld stop

#查看mysql和mariadb相關的包

rpm -qa|grep mariadb

[root@localhost opt]# rpm -qa | grep mariadb

mariadb-libs-5.5.64-1.el7.x86_64

[root@localhost opt]# rpm -e mariadb-libs-5.5.64-1.el7.x86_64

error: Failed dependencies:

libmysqlclient.so.18()(64bit) is needed by (installed) perl-DBD-MySQL-4.023-5.el7.x86_64

libmysqlclient.so.18()(64bit) is needed by (installed) postfix-2:2.10.1-6.el7.x86_64

libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) perl-DBD-MySQL-4.023-5.el7.x86_64

libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) postfix-2:2.10.1-6.el7.x86_64

發現沒有多少個，可能是yum安裝，所以用yum查看下安裝的mysql和卸載：

[root@localhost opt]# yum list|grep maria

mariadb-libs.x86_64 1:5.5.64-1.el7 @base

holland-mariabackup.noarch 1.1.20-1.el7 epel

mariadb.x86_64 1:5.5.64-1.el7 base

mariadb-bench.x86_64 1:5.5.64-1.el7 base

mariadb-devel.i686 1:5.5.64-1.el7 base

mariadb-devel.x86_64 1:5.5.64-1.el7 base

mariadb-embedded.i686 1:5.5.64-1.el7 base

mariadb-embedded.x86_64 1:5.5.64-1.el7 base

mariadb-embedded-devel.i686 1:5.5.64-1.el7 base

mariadb-embedded-devel.x86_64 1:5.5.64-1.el7 base

mariadb-libs.i686 1:5.5.64-1.el7 base

mariadb-server.x86_64 1:5.5.64-1.el7 base

mariadb-test.x86_64 1:5.5.64-1.el7 base

#卸載

yum remove mariadb-test.x86_64 mariadb-server.x86_64 mariadb-libs.i686 mariadb-embedded-devel.x86_64 mariadb-embedded-devel.i686 mariadb-embedded.x86_64 mariadb-embedded.i686 mariadb-devel.x86_64 mariadb-devel.i686 mariadb-bench.x86_64 mariadb.x86_64 holland-mariabackup.noarch mariadb-libs.x86_64

二 安裝

結果運行出錯：

mariadb Unknown/unsupported storage engine: InnoDB

網上有忽略這個引擎的辦法，但是我們的表就用InnoDB引擎，所以智能另外想辦法

忽略InnoDB，可以更改my.cnf

[mysqld]

innodb=OFF

ignore-builtin-innodb

skip-innodb

default-storage-engine=myisam

default-tmp-storage-engine=myisam

有人說刪除日志，但是我的數據庫的數據目錄是空的，所以也不存在這個問題。

rm /var/lib/mysql/ib_logfile0

rm /var/lib/mysql/ib_logfile1

看有兩個文件沒有，則touch下目錄和文件：

touch /var/log/mariadb/mariadb.log

chown -R mysql:mysql /var/log/mariadb

mkdir -p /var/run/mariadb

chown -R mysql:mysql /var/run/mariadb

啟動下：

systemctl start mariadb

Job for mariadb.service failed because the control process exited with error code. See "systemctl status mariadb.service" and "journalctl -xe" for details

仍然報錯：

Process: 15688 ExecStart=/usr/local/mysql/bin/mysqld $MYSQLD_OPTS $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION (code=exited, status=1/FAILURE)

Process: 15661 ExecStartPre=/bin/sh -c [ ! -e /usr/local/mysql/bin/galera_recovery ] && VAR= || VAR=`/usr/local/mysql/bin/galera_recovery`; [ $? -eq 0 ] && systemctl set-environment _WSREP_START_POSITION=$VAR || exit 1 (code=exited, status=0/SUCCESS)

Process: 15659 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)

Main PID: 15688 (code=exited, status=1/FAILURE)

Status: "MariaDB server is down"

Jan 07 10:42:43 localhost.localdomain mysqld[15688]: 2020-01-07 10:42:43 0 [Note] InnoDB: Starting shutdown...

Jan 07 10:42:43 localhost.localdomain mysqld[15688]: 2020-01-07 10:42:43 0 [ERROR] Plugin 'InnoDB' init function returned error.

Jan 07 10:42:43 localhost.localdomain mysqld[15688]: 2020-01-07 10:42:43 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.

Jan 07 10:42:43 localhost.localdomain mysqld[15688]: 2020-01-07 10:42:43 0 [Note] Plugin 'FEEDBACK' is disabled.

Jan 07 10:42:43 localhost.localdomain mysqld[15688]: 2020-01-07 10:42:43 0 [ERROR] Unknown/unsupported storage engine: InnoDB

Jan 07 10:42:43 localhost.localdomain mysqld[15688]: 2020-01-07 10:42:43 0 [ERROR] Aborting

Jan 07 10:42:44 localhost.localdomain systemd[1]: mariadb.service: main process exited, code=exited, status=1/FAILURE

Jan 07 10:42:44 localhost.localdomain systemd[1]: Failed to start MariaDB 10.4.11 database server.

Jan 07 10:42:44 localhost.localdomain systemd[1]: Unit mariadb.service entered failed state.

運行：journalctl -xe

查看： /usr/local/mysql/bin/mysqld 報錯是沒有這個目錄，所以看下權限，更改下目錄的權限：

chown -R mysql:mysql /usr/local/mysql

啟動成功！

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