CentOS6CentOS7二进制安装MYSQL5.7，修改默认密码

1、可自定义输入ROOT密码（发现从mysql的log-error日志里不见得能记录初始化密码，因此把输出文本保存下来/root/mysql-install.log，后期从中读取）；

2、检查CentOS7自带的mariadb并卸载；

3、使用YUM安装了一个依赖，yum -y install numactl；

4、my.cnf位置放在/usr/local/mysql/my.cnf，（配置文件水太深，需要好好研究）

废话不多说：

#!/bin/bash
######二进制自动安装数据库脚本root密码Root123456，将脚本和安装包放在/root目录即可###############
######程序目录/usr/local/mysql############
######数据目录软连接到/data/mysql############
######慢日志目录/data/mysql/slowlog############

echo "################检查本机安装mysql的基本条件########################"
echo "Checking  user :"
if [ $(id -u) != "0" ]; then
	echo "Error: You must be root to run this script, please use root to install"
	exit 1
else
	echo "user is root, this is ok!"
fi

if [ -d /data/mysql ]; then
	echo "mysql datadir  /data/mysql is exist! ,this is fail!"
	exit 1
else
	echo "mysql datadir  /data/mysql is not exist,this is ok!"
fi

os_version=`uname -r|cut -d . -f 6`
if [ "$os_version" = "el7" ] || [ "$os_version" = "el6" ]; then
	echo "os version is el6 or el7, this is ok!"
else
	echo "os version isnot el6 or el7, this is fail!"
	exit 1
fi

#set mysql root password
echo "################设置MYSQL默认密码########################"

mysqlrootpwd="Root123456"
echo -e "Please input the root password of mysql:"
read -p "(Default password: Root123456):" mysqlrootpwd
if [ "$mysqlrootpwd" = "" ]; then
	mysqlrootpwd="Root123456"
fi
echo "========================================="
echo "MySQL root password:$mysqlrootpwd"
echo "========================================="

# Initialize  the installation related content.
function InitInstall()
{
	MemTotal=`free -m | grep Mem | awk '{print  $2}'`  
	echo -e "\n 内存Memory is: ${MemTotal} MB "
	#Set timezone
	#rm -rf /etc/localtime
	#ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

	#Delete Old Mysql mariadb program
	oldmysql=`rpm -qa|grep mysql`
	oldmariadb=`rpm -qa|grep mariadb`
	if [ "$oldmysql" != "" ];then
		echo "已存在mysql，正在卸载"
		rpm -e "$oldmysql" --nodeps
	fi
	if [ "$oldmariadb" != "" ];then
		echo "已存在MariaDB，正在卸载"
		rpm -e "$oldmariadb" --nodeps
	fi

	#Disable SeLinux
	if [ -s /etc/selinux/config ]; then
		sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
	fi
	setenforce 0
	
	#install numactl
	yum -y install numactl
}

#Installation of depend on and optimization options.
function InstallDependsAndOpt()
{
echo "添加用户资源限制/etc/security/limits.conf"
cat >>/etc/security/limits.conf<<EOF
* soft nproc 65535
* hard nproc 65535
* soft nofile 65535
* hard nofile 65535
EOF

echo "添加内核调优 /etc/sysctl.conf"
cat >>/etc/sysctl.conf<<EOF
fs.file-max=6815744
net.ipv4.ip_local_port_range = 9000 65500
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
EOF

sysctl -p
}

function InstallMySQL57()
{
echo "============================安装 MySQL 5.7.25=================================="

#mysql directory configuration
groupadd mysql
useradd -r -g mysql -s /bin/false mysql
tar zxf /root/mysql-5.7.25-linux-glibc2.12-x86_64.tar.gz
echo "==========解压MySQL完成=========="
mv /root/mysql-5.7.25-linux-glibc2.12-x86_64 /usr/local/mysql
cd /usr/local/mysql
mkdir mysql-files
chown mysql:mysql mysql-files
chmod 750 mysql-files
bin/mysqld --initialize --user=mysql
bin/mysql_ssl_rsa_setup
#bin/mysqld_safe --user=mysql &
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld

chown -R mysql:mysql /usr/local/mysql
mkdir -p /data/mysql
mv /usr/local/mysql/data /data/mysql/
ln -s /data/mysql/data /usr/local/mysql/
chown -R mysql:mysql /data/mysql

chkconfig --add mysqld
chkconfig --level 2345 mysqld on

cat >>/usr/local/mysql/my.cnf<<EOF
[client]
port=3306
default-character-set=utf8

[mysql]


[mysqld]
port=3306
character_set_server=utf8
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
pid-file=/usr/local/mysql/data/mysqld.pid
#socket=/usr/local/mysql/data/mysql.sock

sql_mode = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"
ssl=0
max_connections=50000
connect_timeout=15
query_cache_size=0
sort_buffer_size=20m
tmp_table_size=96m
########log settings########
log_error=/usr/local/mysql/data/mysqld.log
slow_query_log = 1
slow_query_log_file = /usr/local/mysql/data/slow.log

#skip_name_resolve=ON

########innodb settings########
innodb_buffer_pool_size=128m
innodb_buffer_pool_instances=5
innodb_log_file_size=128m
innodb_thread_concurrency=0
innodb_flush_log_at_trx_commit=2
#sync_binlog=0
#binlog_order_commits=ON
#transaction_isolation=READ-COMMITTED
#slave_parallel_workers=10

EOF
echo "=================================================================="
}
function ChangePasswd()
{
read -p "是否将mysql/bin加入环境变量（输入y/Y加入，其他不加入）：" inputMsg
if [ "$inputMsg" = 'y' ] || [ "$inputMsg" = 'Y' ] 
then
    echo 'export PATH=$PATH:/usr/local/mysql/bin'>>/etc/profile
	sleep 2
	source /etc/profile
	echo "添加完成"d
else
    echo "不添加"
fi

echo "################启动MYSQL#################"
/etc/init.d/mysqld start
if [ "$?" == "0" ] 
then 
	echo "mysql启动成功"
else
	echo "mysql启动失败，退出"
	exit 1
fi


#查看root随机密码
echo "================================修改密码================================="
passwd=`grep 'A temporary password' ~/mysql-install.log | awk -F"root@localhost: " '{ print $2}' `
echo "初始密码为$passwd"
#登录数据库
/usr/local/mysql/bin/mysql -uroot -p${passwd} --connect-expired-password <<EOF
set password = '${mysqlrootpwd}';
grant all privileges on *.* to 'system'@'%' identified by '${mysqlrootpwd}';
flush privileges;
exit
EOF

# cat > /tmp/mysql_sec_script<<EOF
# use mysql;
# delete from mysql.user where user!='root' or host!='localhost';
# grant all privileges on *.* to 'sys_admin'@'%' identified by 'MANAGER';
# flush privileges;
# EOF

# /usr/local/mysql/bin/mysql -u root -p$mysqlrootpwd -h localhost < /tmp/mysql_sec_script
#rm -f /tmp/mysql_sec_script
#/etc/init.d/mysqld restart

echo "============================MySQL 5.7.25 安装完成========================="
}

function CheckInstall()
{
echo "============================== Check install ============================="
echo "Checking..."

if [ -s /usr/local/mysql/bin/mysql ] && [ -s /usr/local/mysql/bin/mysqld_safe ] ; then
  echo "MySQL: OK"
else
  echo "Error: /usr/local/mysql not found!!!MySQL install failed."
fi

echo "Install MySQL 5.7.25 completed! enjoy it."
echo "===========================查看进程================================"
ps -ef |grep mysql
echo "===========================查看端口================================"
if [ "$os_version" = "el7" ] ; then
	ss -nptl |column -t
else
	netstat -nptl
fi

}
 
#The installation log
InitInstall 2>&1 | tee /root/mysql-install.log
InstallDependsAndOpt 2>&1 | tee -a /root/mysql-install.log
InstallMySQL57 2>&1 | tee -a /root/mysql-install.log
ChangePasswd 2>&1 | tee -a /root/mysql-install.log
CheckInstall 2>&1 | tee -a /root/mysql-install.log