Centos7安裝Percona5.7

OS: Centos7.0
DB: Percona5.7

1. 通過yum安裝

## 刪除之前的mysql數據庫, 我用的是centos7.再安裝虛擬機的時候，預裝了很多軟件。所以mysql和mariadb的一些東西安裝了。必須要刪除掉
rpm -qa | grep mysql
rpm -qa | grep mariadb

rpm -e mysql 
rpm -e --nodeps mysql 
yum remove mariadb-libs-5.5.41-2.el7_0.x86_64

## 安裝其他依賴包：perl 和libaio
yum -y install perl-Module-Install.noarch
yum -y install libaio libaio-devel

## 配置yum安裝源
yum install https://www.percona.com/redir/downloads/percona-release/redhat/0.1-4/percona-release-0.1-4.noarch.rpm  ## 最新的是0.1-4

## 安裝percona
yum install Percona-Server-server-57 

2. 通過rpm安裝

wget https://www.percona.com/downloads/Percona-Server-LATEST/Percona-Server-5.7.18-16/binary/redhat/7/x86_64/Percona-Server-5.7.18-16-rd7301f8-el7-x86_64-bundle.tar

tar xvf Percona-Server-5.7.18-16-rd7301f8-el7-x86_64-bundle.tar

rpm -ivh Percona-Server-shared-compat-57-5.7.18-16.1.el7.x86_64
rpm -ivh Percona-Server-shared-57-5.7.18-16.1.el7.x86_64
rpm -ivh Percona-Server-client-57-5.7.18-16.1.el7.x86_64
rpm -ivh Percona-Server-server-57-5.7.18-16.1.el7.x86_64

3. 配置

## 配置用戶組
groupadd mysql
useradd -r -g mysql mysql 

mysqld --initialize --user=mysql --datadir=/user/local/webserver/mysql ## 如果沒報錯，恭喜你很幸運

vim /etc/percona-server.conf.d/mysqld.cnf

[mysqld]

datadir=/usr/local/webserver/mysql
socket=/usr/local/webserver/mysql/mysql.sock

# initialize need
explicit_defaults_for_timestamp=true

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

[mysql]
socket=/usr/local/webserver/mysql/mysql.sock

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

service mysqld start ## 如果沒報錯，恭喜你很幸運。

4. 登錄

cat /var/log/mysqld.log | grep "temporary password" ## 找到root的初始密碼。

mysql -u root -p 

set password = password('root');

5. ERROR

• mysqld --initialize 報錯：TIMESTAMP with implicit DEFAULT value is deprecated

  從 5.6開始，timestamp 的默認行為已經是 deprecated

vim /etc/percona-server.conf.d/mysqld.cnf

explicit_defaults_for_timestamp=true ## 加上這段(顯示指定默認值為timestamp類型的字段)

• mysql --initialize 報錯：initialize specified but the data directory has files in it. Aborting.

  datadir 已經存在了。刪除即可

• service mysqld start 報錯：InnoDB: .\ibdata1 must be writable > InnoDB 在啟動時需要配置LOG File的目錄，如果沒有制定目錄，則會在MySQL Data目錄下創建2個日志文件ib_logfile0 and ib_logfile1，在創建的時候需要確保MYSQL擁有對該目錄的權限。

ps -ef | grep mysqld
kill 21222 ## kill掉mysqld的進程
rm /usr/local/webserver/mysql/ib_logfil*
service mysqld start

• service mysqld start 報錯：Could not create unix socket lock file /user/lib/mysql/mysql.sock.lock.

## 很簡單的問題。加權限即可
chown -R mysql:mysql /user/lib/mysql/

6. 總結

安裝mysql的數據庫必要步驟有：

1. 安裝依賴包
2. 安裝mysql數據庫
3. 初始化服務（mysqld --initialize）
4. 修改配置文件，配置datadir目錄權限和用戶
5. 啟動服務，鏈接數據庫

參考資料

1. MySQL 5.6 中TIMESTAMP with implicit DEFAULT value is deprecated錯誤
2. MYSQL 服務無法啟動，錯誤日志：InnoDB: .\ibdata1 must be writable
3. 如何在 CentOS 7 上安裝 Percona服務器
4. percona5.7 源碼安裝

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