mysql在使用過程中,發現連線數超了~~~~
[root@linux-node1 ~]# mysql -u glance -h 192.168.1.17 -p
Enter password:
ERROR 1040 (08004): Too many connections
解決辦法,這也是centos7下修改mysql連線數的做法:
1)臨時修改
MariaDB [(none)]> show variables like "max_connections";
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| max_connections | 214 |
+-----------------+-------+
1 row in set (0.00 sec)
MariaDB [(none)]> set GLOBAL max_connections=1000;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show variables like "max_connections";
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| max_connections | 1000 |
+-----------------+-------+
1 row in set (0.00 sec)
2)永久修改:
配置/etc/my.cnf
[mysqld]新新增一行如下引數:
max_connections=1000
重啟mariadb服務,再次檢視mariadb資料庫最大連線數,可以看到最大連線數是214,並非我們設定的1000。
MariaDB [(none)]> show variables like 'max_connections';
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| max_connections | 214 |
+-----------------+-------+
這是由於mariadb有預設開啟檔案數限制。可以通過配置/usr/lib/systemd/system/mariadb.service來調大開啟檔案數目。
配置/usr/lib/systemd/system/mariadb.service
[Service]新新增兩行如下引數:
LimitNOFILE=10000
LimitNPROC=10000
重新載入系統服務,並重啟mariadb服務
systemctl --system daemon-reload
systemctl restart mariadb.service
再次檢視mariadb資料庫最大連線數,可以看到最大連線數已經是1000
MariaDB [(none)]> show variables like 'max_connections';
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| max_connections | 1000 |
+-----------------+-------+
=============================================================================
mysql設定32位md5值的密文密碼
如下,設定admin使用者的密碼為"123!@#ad" mysql> select * from admin_user; +----+----------+--------------------------------------------------------------------+----------------------+---------------------+ | id | username | password | create_time | update_time | +----+---------------+---------------------------------------------------------------+----------------------+---------------------+ | 1 | admin | 4ad597c11755c50d00457f4420365763 | 1538979880 | 1538979880 | +----+---------------+---------------------------------------------------------------+----------------------+---------------------+ 1 row in set (0.00 sec) mysql> update admin_user set username = 'admin',password = md5('123!@#ad') where id = 1 mysql> select * from admin_user; +----+----------+--------------------------------------------------------------------+----------------------+---------------------+ | id | username | password | create_time | update_time | +----+---------------+---------------------------------------------------------------+----------------------+---------------------+ | 1 | admin | 0fy866r8662a70d85632u90563212687 | 1541676212 | 1541676212 | +----+---------------+---------------------------------------------------------------+----------------------+---------------------+ 1 row in set (0.00 sec)