安装Redis
yum install epel-release
yum install redis
yum方式安装的Redis的配置文件位置
vim /etc/redis.conf
设置redis为开机自动启动
chkconfig redis on
常常修改的地方有
1. 修改配置文件，监听所有的IP地址 # bind 127.0.01
2. 配置密码 #requirepass foobared 打开注释，设置密码即可
redis命令操作
启动 service redis restart
停止 service redis stop
重启 service redis restart
查看状态 service redis status
进入本机redis
无密码形式 redis-cli
密码形式 redis-cli -h 127.0.0.1 -p 6379 -a myPassword
为什么选择5.7
因为8.0版本和5.6版本安装和使用太坑了
下载mysql源安装包
# wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
安装mysql源
yum localinstall mysql57-community-release-el7-8.noarch.rpm
检查mysql源是否安装成功
# yum repolist enabled | grep "mysql.*-community.*"
mysql-connectors-community/x86_64 MySQL Connectors Community 74
mysql-tools-community/x86_64 MySQL Tools Community 74
mysql57-community/x86_64 MySQL 5.7 Community Server 307
安装时可能会出现类似以下的错误：
Error downloading packages:
mysql-community-client-5.7.27-1.el7.x86_64: [Errno 256] No more mirrors to try.
mysql-community-common-5.7.27-1.el7.x86_64: [Errno 256] No more mirrors to try.
解决方案如下：
1. 清理软件源 yum clean all
2. 建立源数据缓存 yum makecache
安装MySQL
yum install mysql-community-server
安装过程图
静静等待下载和安装即可。若下载速度较慢，如图、则可以ctrl+c强制关掉下载过程，然后重新执行安装命令即可，比较好使。我认为正常速度500-800K
查看安装了哪些包
# rpm -qa | grep mysql
mysql57-community-release-el7-8.noarch
mysql-community-common-5.7.30-1.el7.x86_64
mysql-community-client-5.7.30-1.el7.x86_64
mysql-community-libs-5.7.30-1.el7.x86_64
mysql-community-libs-compat-5.7.30-1.el7.x86_64
mysql-community-server-5.7.30-1.el7.x86_64
启动MySQL服务
service mysqld start
service mysqld status
查看默认随机密码，登录，并且修改
# grep 'temporary password' /var/log/mysqld.log
# mysql -uroot -p
# ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';
# flush privileges;
若通过grep 'temporary password' /var/log/mysqld.log 命令无法输出默认密码则需要
1.删除原来安装过的mysql残留的数据（这一步非常重要，问题就出在这）
rm -rf /var/lib/mysql
2.重启mysqld服务
service mysqld restart
3.再去找临时密码
grep 'temporary password' /var/log/mysqld.log
远程登录
# GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'Abcd1234!' WITH GRANT OPTION;
# flush privileges;
默认mysql相关文件地址
配置文件：/etc/my.cnf
日志文件：/var/log/mysqld.log
服务启动脚本：/usr/lib/systemd/system/mysqld.service
socket文件：/var/run/mysqld/mysqld.pid
修改mysql默认编码为utf8
vim /etc/my.cnf
在[mysqld]下面增加
character_set_server=utf8
重启MySQL
systemctl restart mysqld
然后进入到mysql查看
show variables like 'character%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.01 sec)
卸载mysql
service mysqld stop
rpm -qa | grep -i mysql
mysql-community-server-8.0.13-1.el7.x86_64
mysql-community-libs-8.0.13-1.el7.x86_64
mysql-community-common-8.0.13-1.el7.x86_64
mysql-community-client-8.0.13-1.el7.x86_64
rpm -ev mysql-community-server-8.0.13-1.el7.x86_64 --nodeps
rpm -ev mysql-community-libs-8.0.13-1.el7.x86_64 --nodeps
rpm -ev mysql-community-common-8.0.13-1.el7.x86_64 --nodeps
rpm -ev mysql-community-client-8.0.13-1.el7.x86_64 --nodeps
find / -name mysql
rm -rf /var/lib/mysql
rm -rf /var/lib/mysql/mysql
rm -rf /etc/my.cnf
