1:查看OS版本和下载文件
[root@VM-0-12-centos opt]# cat /etc/centos-release
CentOS Linux release 8.4.2105
wget https://dev.mysql.com/get/mysql80-community-release-el7-6.noarch.rpm
[root@VM-0-12-centos opt]# wget https://dev.mysql.com/get/mysql80-community-release-el7-6.noarch.rpm
--2022-11-09 22:45:03-- https://dev.mysql.com/get/mysql80-community-release-el7-6.noarch.rpm
Resolving dev.mysql.com (dev.mysql.com)... 23.41.182.135, 2600:1417:e800:189::2e31, 2600:1417:e800:18a::2e31
Connecting to dev.mysql.com (dev.mysql.com)|23.41.182.135|:443... connected.
HTTP request sent, awaiting response... 302 Moved Temporarily
Location: https://repo.mysql.com//mysql80-community-release-el7-6.noarch.rpm [following]
--2022-11-09 22:45:05-- https://repo.mysql.com//mysql80-community-release-el7-6.noarch.rpm
Resolving repo.mysql.com (repo.mysql.com)... 23.55.124.230
Connecting to repo.mysql.com (repo.mysql.com)|23.55.124.230|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 11288 (11K) [application/x-redhat-package-manager]
Saving to: ‘mysql80-community-release-el7-6.noarch.rpm’
mysql80-community-release-el7-6.noarch.rpm 100%[================================================================================================================>] 11.02K 42.0KB/s in 0.3s
2022-11-09 22:45:06 (42.0 KB/s) - ‘mysql80-community-release-el7-6.noarch.rpm’ saved [11288/11288]
2:安装RPM
sudo rpm -Uvh mysql80-community-release-el7-6.noarch.rpm
[root@VM-0-12-centos opt]# sudo rpm -Uvh mysql80-community-release-el7-6.noarch.rpm
warning: mysql80-community-release-el7-6.noarch.rpm: Header V4 RSA/SHA256 Signature, key ID 3a79bd29: NOKEY
Verifying... ################################# [100%]
Preparing... ################################# [100%]
Updating / installing...
1:mysql80-community-release-el7-6 ################################# [100%]
3.查看版本
yum repolist all | grep mysql
[root@VM-0-12-centos opt]# yum repolist all | grep mysql
mysql-cluster-7.5-community MySQL Cluster 7.5 Community disabled
mysql-cluster-7.5-community-source MySQL Cluster 7.5 Community - Sou disabled
mysql-cluster-7.6-community MySQL Cluster 7.6 Community disabled
mysql-cluster-7.6-community-source MySQL Cluster 7.6 Community - Sou disabled
mysql-cluster-8.0-community MySQL Cluster 8.0 Community disabled
mysql-cluster-8.0-community-debuginfo MySQL Cluster 8.0 Community - Deb disabled
mysql-cluster-8.0-community-source MySQL Cluster 8.0 Community - Sou disabled
mysql-connectors-community MySQL Connectors Community enabled
mysql-connectors-community-debuginfo MySQL Connectors Community - Debu disabled
mysql-connectors-community-source MySQL Connectors Community - Sour disabled
mysql-tools-community MySQL Tools Community enabled
mysql-tools-community-debuginfo MySQL Tools Community - Debuginfo disabled
mysql-tools-community-source MySQL Tools Community - Source disabled
mysql-tools-preview MySQL Tools Preview disabled
mysql-tools-preview-source MySQL Tools Preview - Source disabled
mysql57-community MySQL 5.7 Community Server disabled
mysql57-community-source MySQL 5.7 Community Server - Sour disabled
mysql80-community MySQL 8.0 Community Server enabled
mysql80-community-debuginfo MySQL 8.0 Community Server - Debu disabled
mysql80-community-source MySQL 8.0 Community Server - Sour disabled
4.启用5.7的版本
[root@VM-0-12-centos opt]# sudo dnf config-manager --disable mysql80-community
[root@VM-0-12-centos opt]# sudo dnf config-manager --enable mysql57-community
检查下
[root@VM-0-12-centos opt]# yum repolist all | grep mysql
mysql-cluster-7.5-community MySQL Cluster 7.5 Community disabled
mysql-cluster-7.5-community-source MySQL Cluster 7.5 Community - Sou disabled
mysql-cluster-7.6-community MySQL Cluster 7.6 Community disabled
mysql-cluster-7.6-community-source MySQL Cluster 7.6 Community - Sou disabled
mysql-cluster-8.0-community MySQL Cluster 8.0 Community disabled
mysql-cluster-8.0-community-debuginfo MySQL Cluster 8.0 Community - Deb disabled
mysql-cluster-8.0-community-source MySQL Cluster 8.0 Community - Sou disabled
mysql-connectors-community MySQL Connectors Community enabled
mysql-connectors-community-debuginfo MySQL Connectors Community - Debu disabled
mysql-connectors-community-source MySQL Connectors Community - Sour disabled
mysql-tools-community MySQL Tools Community enabled
mysql-tools-community-debuginfo MySQL Tools Community - Debuginfo disabled
mysql-tools-community-source MySQL Tools Community - Source disabled
mysql-tools-preview MySQL Tools Preview disabled
mysql-tools-preview-source MySQL Tools Preview - Source disabled
mysql57-community MySQL 5.7 Community Server enabled
mysql57-community-source MySQL 5.7 Community Server - Sour disabled
mysql80-community MySQL 8.0 Community Server disabled
mysql80-community-debuginfo MySQL 8.0 Community Server - Debu disabled
mysql80-community-source MySQL 8.0 Community Server - Sour disabled5.禁用默认 MySQL 模块
[root@VM-0-12-centos opt]# sudo dnf module disable mysql
MySQL 5.7 Community Server 869 kB/s | 2.8 MB 00:03
MySQL Connectors Community 43 kB/s | 53 kB 00:01
MySQL Tools Community 333 kB/s | 778 kB 00:02
Dependencies resolved.
============================================================================================================================================================================================================
Package Architecture Version Repository Size
============================================================================================================================================================================================================
Disabling modules:
mysql
Transaction Summary
============================================================================================================================================================================================================
Is this ok [y/N]: y
Complete!
6.安装sudo yum install mysql-community-server
[root@VM-0-12-centos opt]# sudo yum install mysql-community-server
Last metadata expiration check: 0:00:49 ago on Wed 09 Nov 2022 11:00:05 PM CST.
Dependencies resolved.
============================================================================================================================================================================================================
Package Architecture Version Repository Size
============================================================================================================================================================================================================
Installing:
mysql-community-server x86_64 5.7.40-1.el7 mysql57-community 178 M
Upgrading:
ncurses x86_64 6.1-9.20180224.el8 baseos 387 k
ncurses-base noarch 6.1-9.20180224.el8 baseos 81 k
ncurses-libs x86_64 6.1-9.20180224.el8 baseos 334 k
Installing dependencies:
mysql-community-client x86_64 5.7.40-1.el7 mysql57-community 28 M
mysql-community-common x86_64 5.7.40-1.el7 mysql57-community 311 k
mysql-community-libs x86_64 5.7.40-1.el7 mysql57-community 2.6 M
ncurses-compat-libs x86_64 6.1-9.20180224.el8 baseos 328 k
Transaction Summary
============================================================================================================================================================================================================
Install 5 Packages
Upgrade 3 Packages
Total download size: 211 M
Is this ok [y/N]: y
Downloading Packages:
(1/8): ncurses-compat-libs-6.1-9.20180224.el8.x86_64.rpm 984 kB/s | 328 kB 00:00
(2/8): mysql-community-common-5.7.40-1.el7.x86_64.rpm 169 kB/s | 311 kB 00:01
(3/8): mysql-community-libs-5.7.40-1.el7.x86_64.rpm 1.2 MB/s | 2.6 MB 00:02
(4/8): ncurses-6.1-9.20180224.el8.x86_64.rpm 831 kB/s | 387 kB 00:00
(5/8): ncurses-base-6.1-9.20180224.el8.noarch.rpm 415 kB/s | 81 kB 00:00
(6/8): ncurses-libs-6.1-9.20180224.el8.x86_64.rpm 849 kB/s | 334 kB 00:00
(7/8): mysql-community-client-5.7.40-1.el7.x86_64.rpm 1.6 MB/s | 28 MB 00:17
(8/8): mysql-community-server-5.7.40-1.el7.x86_64.rpm 1.1 MB/s | 178 MB 02:43
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 1.3 MB/s | 211 MB 02:45
warning: /var/cache/dnf/mysql57-community-8dd65da190328bba/packages/mysql-community-client-5.7.40-1.el7.x86_64.rpm: Header V4 RSA/SHA256 Signature, key ID 3a79bd29: NOKEY
MySQL 5.7 Community Server 0.0 B/s | 0 B 00:00
Curl error (37): Couldn't read a file:// file for file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022 [Couldn't open file /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022]
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'yum clean packages'.
7.提示签名有问题，导入签名
[root@VM-0-12-centos opt]# sudo rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022
然后再次安装，可以看到完成了。
[root@VM-0-12-centos opt]# sudo yum install mysql-community-server
Last metadata expiration check: 0:17:47 ago on Wed 09 Nov 2022 11:00:05 PM CST.
Dependencies resolved.
============================================================================================================================================================================================================
Package Architecture Version Repository Size
============================================================================================================================================================================================================
Installing:
mysql-community-server x86_64 5.7.40-1.el7 mysql57-community 178 M
Upgrading:
ncurses x86_64 6.1-9.20180224.el8 baseos 387 k
ncurses-base noarch 6.1-9.20180224.el8 baseos 81 k
ncurses-libs x86_64 6.1-9.20180224.el8 baseos 334 k
Installing dependencies:
mysql-community-client x86_64 5.7.40-1.el7 mysql57-community 28 M
mysql-community-common x86_64 5.7.40-1.el7 mysql57-community 311 k
mysql-community-libs x86_64 5.7.40-1.el7 mysql57-community 2.6 M
ncurses-compat-libs x86_64 6.1-9.20180224.el8 baseos 328 k
Transaction Summary
============================================================================================================================================================================================================
Install 5 Packages
Upgrade 3 Packages
Total size: 211 M
Is this ok [y/N]: y
Downloading Packages:
[SKIPPED] ncurses-compat-libs-6.1-9.20180224.el8.x86_64.rpm: Already downloaded
[SKIPPED] mysql-community-client-5.7.40-1.el7.x86_64.rpm: Already downloaded
[SKIPPED] mysql-community-common-5.7.40-1.el7.x86_64.rpm: Already downloaded
[SKIPPED] mysql-community-libs-5.7.40-1.el7.x86_64.rpm: Already downloaded
[SKIPPED] mysql-community-server-5.7.40-1.el7.x86_64.rpm: Already downloaded
[SKIPPED] ncurses-6.1-9.20180224.el8.x86_64.rpm: Already downloaded
[SKIPPED] ncurses-base-6.1-9.20180224.el8.noarch.rpm: Already downloaded
[SKIPPED] ncurses-libs-6.1-9.20180224.el8.x86_64.rpm: Already downloaded
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Upgrading : ncurses-base-6.1-9.20180224.el8.noarch 1/11
Installing : mysql-community-common-5.7.40-1.el7.x86_64 2/11
Installing : mysql-community-libs-5.7.40-1.el7.x86_64 3/11
Running scriptlet: mysql-community-libs-5.7.40-1.el7.x86_64 3/11
Installing : ncurses-compat-libs-6.1-9.20180224.el8.x86_64 4/11
Installing : mysql-community-client-5.7.40-1.el7.x86_64 5/11
Upgrading : ncurses-libs-6.1-9.20180224.el8.x86_64 6/11
Upgrading : ncurses-6.1-9.20180224.el8.x86_64 7/11
Running scriptlet: mysql-community-server-5.7.40-1.el7.x86_64 8/11
Installing : mysql-community-server-5.7.40-1.el7.x86_64 8/11
Running scriptlet: mysql-community-server-5.7.40-1.el7.x86_64 8/11
Cleanup : ncurses-6.1-7.20180224.el8.x86_64 9/11
Cleanup : ncurses-libs-6.1-7.20180224.el8.x86_64 10/11
Cleanup : ncurses-base-6.1-7.20180224.el8.noarch 11/11
Running scriptlet: ncurses-base-6.1-7.20180224.el8.noarch 11/11
[/usr/lib/tmpfiles.d/mysql.conf:23] Line references path below legacy directory /var/run/, updating /var/run/mysqld → /run/mysqld; please update the tmpfiles.d/ drop-in file accordingly.
Verifying : ncurses-compat-libs-6.1-9.20180224.el8.x86_64 1/11
Verifying : mysql-community-client-5.7.40-1.el7.x86_64 2/11
Verifying : mysql-community-common-5.7.40-1.el7.x86_64 3/11
Verifying : mysql-community-libs-5.7.40-1.el7.x86_64 4/11
Verifying : mysql-community-server-5.7.40-1.el7.x86_64 5/11
Verifying : ncurses-6.1-9.20180224.el8.x86_64 6/11
Verifying : ncurses-6.1-7.20180224.el8.x86_64 7/11
Verifying : ncurses-base-6.1-9.20180224.el8.noarch 8/11
Verifying : ncurses-base-6.1-7.20180224.el8.noarch 9/11
Verifying : ncurses-libs-6.1-9.20180224.el8.x86_64 10/11
Verifying : ncurses-libs-6.1-7.20180224.el8.x86_64 11/11
Upgraded:
ncurses-6.1-9.20180224.el8.x86_64 ncurses-base-6.1-9.20180224.el8.noarch ncurses-libs-6.1-9.20180224.el8.x86_64
Installed:
mysql-community-client-5.7.40-1.el7.x86_64 mysql-community-common-5.7.40-1.el7.x86_64 mysql-community-libs-5.7.40-1.el7.x86_64 mysql-community-server-5.7.40-1.el7.x86_64
ncurses-compat-libs-6.1-9.20180224.el8.x86_64
Complete!
8.启动mysql
[root@VM-0-12-centos opt]# systemctl start mysqld.service
9.查看root密码
[root@VM-0-12-centos opt]# sudo grep 'temporary password' /var/log/mysqld.log
2022-11-09T15:26:28.701709Z 1 [Note] A temporary password is generated for root@localhost: fwTMfT.8YqM_10.连接mysql,操作的时候提示要修改密码
[root@VM-0-12-centos ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.40
Copyright (c) 2000, 2022, Oracle and/or its affiliates.
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 global variables like '%isolation%';
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'uAiqfwTMfT';
Query OK, 0 rows affected (0.00 sec)
mysql> show global variables like '%isolation%';
+-----------------------+-----------------+
| Variable_name | Value |
+-----------------------+-----------------+
| transaction_isolation | REPEATABLE-READ |
| tx_isolation | REPEATABLE-READ |
+-----------------------+-----------------+
11:设置隔离级别
mysql> show global variables like '%isolation%';
+-----------------------+-----------------+
| Variable_name | Value |
+-----------------------+-----------------+
| transaction_isolation | REPEATABLE-READ |
| tx_isolation | REPEATABLE-READ |
+-----------------------+-----------------+
2 rows in set (0.00 sec)
mysql> set global transaction_isolation ='read-committed';
Query OK, 0 rows affected (0.00 sec)
mysql> show global variables like '%isolation%';
+-----------------------+----------------+
| Variable_name | Value |
+-----------------------+----------------+
| transaction_isolation | READ-COMMITTED |
| tx_isolation | READ-COMMITTED |
+-----------------------+----------------+
2 rows in set (0.00 sec)