#mysql8 centos7
mysql官網下載mysql-server的rpm安裝包
[root@greenvm-wys1946v1 mysql]# ll
total 28
-rw-r--r--. 1 root root 25820 Jan 16 14:18 mysql80-community-release-el7-1.noarch.rpm
[root@greenvm-wys1946v1 mysql]# pwd
/mysql
開始執行安裝
[root@greenvm-wys1946v1 mysql]# rpm -ivh mysql80-community-release-el7-1.noarch.rpm
檢查mysql源是否安裝成功
[root@greenvm-wys1946v1 mysql]# yum repolist enabled | grep "mysql.*-community.*"
mysql-connectors-community/x86_64 MySQL Connectors Community 74
mysql-tools-community/x86_64 MySQL Tools Community 74
mysql80-community/x86_64 MySQL 8.0 Community Server 49
[root@greenvm-wys1946v1 mysql]#
以上代表源安裝成功,開始安裝install
[root@greenvm-wys1946v1 mysql]# yum install -y mysql-community-server
啓動mysql服務
systemctl start mysqld
或者
service mysqld start
查看mysql的啓動狀態
systemctl status mysqld
或者
service mysqld status
[root@Campusnetwork mysql]# systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: active (running) since 三 2019-01-16 22:28:57 CST; 51min ago
Docs: man:mysqld(8)
http://dev.mysql.com/doc/refman/en/using-systemd.html
Main PID: 5739 (mysqld)
Status: "SERVER_OPERATING"
CGroup: /system.slice/mysqld.service
└─5739 /usr/sbin/mysqld
1月 16 22:28:39 Campusnetwork.net.hziee.edu.cn systemd[1]: Starting MySQL Server...
1月 16 22:28:57 Campusnetwork.net.hziee.edu.cn systemd[1]: Started MySQL Server.
[root@Campusnetwork mysql]#
重啓mysql
systemctl restart mysqld
或者
service mysqld restart
停止mysql
systemctl stop mysqld
或者
service mysqld stop
設置開機啓動
[root@Campusnetwork mysql]# systemctl enable mysqld
[root@Campusnetwork mysql]# systemctl daemon-reload
查看默認密碼
/var/log/mysqld.log
查看mysql端口號
mysql> show variables like '%port%';
+--------------------------+-------+
| Variable_name | Value |
+--------------------------+-------+
| large_files_support | ON |
| mysqlx_port | 33060 |
| mysqlx_port_open_timeout | 0 |
| port | 3306 |
| report_host | |
| report_password | |
| report_port | 3306 |
| report_user | |
| require_secure_transport | OFF |
+--------------------------+-------+
9 rows in set (0.00 sec)
查看mysql字符編碼
mysql> show variables like '%character%';
+--------------------------+--------------------------------+
| Variable_name | Value |
+--------------------------+--------------------------------+
| character_set_client | utf8mb4 |
| character_set_connection | utf8mb4 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_results | utf8mb4 |
| character_set_server | utf8mb4 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql-8.0/charsets/ |
+--------------------------+--------------------------------+
8 rows in set (0.01 sec)
查看密碼策略
mysql> show variables like '%password%';
+----------------------------------------------+-----------------+
| Variable_name | Value |
+----------------------------------------------+-----------------+
| caching_sha2_password_auto_generate_rsa_keys | ON |
| caching_sha2_password_private_key_path | private_key.pem |
| caching_sha2_password_public_key_path | public_key.pem |
| default_password_lifetime | 0 |
| disconnect_on_expired_password | ON |
| mysql_native_password_proxy_users | OFF |
| password_history | 0 |
| password_require_current | OFF |
| password_reuse_interval | 0 |
| report_password | |
| sha256_password_auto_generate_rsa_keys | ON |
| sha256_password_private_key_path | private_key.pem |
| sha256_password_proxy_users | OFF |
| sha256_password_public_key_path | public_key.pem |
| validate_password.check_user_name | ON |
| validate_password.dictionary_file | |
| validate_password.length | 8 |
| validate_password.mixed_case_count | 1 |
| validate_password.number_count | 1 |
| validate_password.policy | MEDIUM |
| validate_password.special_char_count | 1 |
+----------------------------------------------+-----------------+
21 rows in set (0.01 sec)
密碼策略介紹
validate_password_policy：密碼策略，默認爲MEDIUM策略
validate_password_dictionary_file：密碼策略文件，策略爲STRONG才需要
validate_password_length：密碼最少長度
validate_password_mixed_case_count：大小寫字符長度，至少1個
validate_password_number_count ：數字至少1個
validate_password_special_char_count：特殊字符至少1個
上述參數是默認策略MEDIUM的密碼檢查規則。
mysql主要有三種密碼策略
| Policy | DESC |
|---|---|
| 0 or LOW | Length |
| 1 or MEDIUM | Length;numeric;lowercase/uppercase and special character |
| 2 or STRONG | Length;numeric;lowercase/uppercase and special character and dictionary file |
更改密碼
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'shiqi2019';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'shiqi2019@';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Shiqi2019@';
Query OK, 0 rows affected (0.01 sec)
mysql> flush privileges
-> ;
Query OK, 0 rows affected (0.01 sec)
遠程連接
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select user,host from user;
+------------------+-----------+
| user | host |
+------------------+-----------+
| mysql.infoschema | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
+------------------+-----------+
4 rows in set (0.00 sec)
mysql> update user set host='%' where user='root';
Query OK, 1 row affected (0.08 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select user,host from user;
+------------------+-----------+
| user | host |
+------------------+-----------+
| root | % |
| mysql.infoschema | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
+------------------+-----------+
4 rows in set (0.00 sec)
mysql> select user,host,plugin,authentication_string from user;
+------------------+-----------+-----------------------+------------------------------------------------------------------------+
| user | host | plugin | authentication_string |
+------------------+-----------+-----------------------+------------------------------------------------------------------------+
| root | % | caching_sha2_password | $A$005$hocX4U2@R%bkw_ Z:YB3G0wW9b9u6aor.NLk.yL5pqK.3aqc7w9DKgoUu4uF2 |
| mysql.infoschema | localhost | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| mysql.session | localhost | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| mysql.sys | localhost | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
+------------------+-----------+-----------------------+------------------------------------------------------------------------+
4 rows in set (0.00 sec)
mysql> alter user 'root'@'%' identified with mysql_native_password by 'Shiqi2019@';
ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'%'
mysql> ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password by 'Shiqi2019@';
Query OK, 0 rows affected (0.04 sec)
mysql> select user,host,plugin,authentication_string from user;
+------------------+-----------+-----------------------+------------------------------------------------------------------------+
| user | host | plugin | authentication_string |
+------------------+-----------+-----------------------+------------------------------------------------------------------------+
| root | % | mysql_native_password | *1C010A5F5FFBEFCCBF18420A68EEBCF0845A9A75 |
| mysql.infoschema | localhost | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| mysql.session | localhost | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| mysql.sys | localhost | caching_sha2_password | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
+------------------+-----------+-----------------------+------------------------------------------------------------------------+
4 rows in set (0.00 sec)
部分參數查詢命令
#查詢mysql最大連接數設置
show global variables like 'max_conn%';
SELECT @@MAX_CONNECTIONS AS 'Max Connections';
# 查看最大鏈接數
show global status like 'Max_used_connections';
# 查看慢查詢日誌是否開啓以及日誌位置
show variables like 'slow_query%';
# 查看慢查詢日誌超時記錄時間
show variables like 'long_query_time';
# 查看鏈接創建以及現在正在鏈接數
show status like 'Threads%';
# 查看數據庫當前鏈接
show processlist;
# 查看數據庫配置
show variables like '%quer%';！