Overview

Error Log was introduced in ProxySQL since version 0.1. This feature allows messages produced by ProxySQL to be logged into a file. When ProxySQL is launched with the -f option, all messages go to stdout. To enable this feature, set the variable errorlog in the config file to a file where the logging will be performed. This must be an absolute path. Relative paths lead to unexpected results. When enabled, the following events are logged:

  • Startup messages
  • Exit messages
  • Loaded plugins
  • Error messages
  • Warning messages
  • Info messages
  • Debug messages
  • Variable setting

Variables

  • errorlog: this variable defines the base name of the error log where events are logged. The default value of this variable is [datadir]/proxysql.log where datadir is set in the config file or by the -D option. This must be an absolute path. Relative paths lead to unexpected results.
  • mysql-verbose_query_error: this variable controls the verbosity of query errors. Set to true to increase the verbosity.

Future versions may enable runtime errorlog configuration.

Logging format

The current implementation supports only one logging format: syslog like plain text Attributes:

  • date: Date as YYYY-MM-DD.
  • time: Time as HH:MM:SS localtime.
  • file:line:function:: Urace to message producing source code line.
  • [loglevel]: info, warn, error, debug levels.
  • message: Detailed message, can contain multiple lines.

Log rotation

To rotate the log, first rename the logfile to a new name, and issue the ProxySQL command

PROXYSQL FLUSH LOGS;

To rotate logs using logrotate, use this config in /etc/logrotate.d/proxysql:

/var/lib/proxysql/proxysql.log {
daily
rotate 7
missingok
notifempty
compress
postrotate
/usr/bin/mysql --login-path=logrotate -e "PROXYSQL FLUSH LOGS"
endscript
create 0600 root root
}

Also add credentials to the mysql credentials store:

mysql_config_editor set --login-path=logrotate --host=localhost --user=logrotate --password

And set up the user in ProxySQL:

INSERT INTO mysql_users (username,password,active) values ('logrotate','SecretPass123',1)

Errorlog vs stdout

Messages that are produced before error log is initialized are not captured. This affects only a few early initialization messages. If you want to capture also these early messages, running ProxySQL in foreground with stdout and stderr redirection is advised:

proxysql -f --idle-threads -D /var/lib/proxysql -c /etc/proxysql.cnf &> /var/log/proxysql/proxysql-error.log

Error Log example

Below is an error log example.

2022-06-10 17:11:36 [INFO] ProxySQL version 2.4.1-12-g3afcc12
2022-06-10 17:11:36 [INFO] Detected OS: Linux trx 5.17.11-xanmod1-x64v2 #0~git20220525.9ffe6c5 SMP Wed May 25 21:27:30 UTC 2022 x86_64
2022-06-10 17:11:36 [INFO] ProxySQL SHA1 checksum: 760ce855664901607cd41b883b386bffda88b3f2
2022-06-10 17:11:36 [INFO] Starting ProxySQL
2022-06-10 17:11:36 [INFO] Successfully started
2022-06-10 17:11:36 [INFO] Angel process started ProxySQL process 3939546
2022-06-10 17:11:36 [INFO] Loaded built-in SQLite3
Standard ProxySQL MySQL Logger rev. 2.0.0714 -- MySQL_Logger.cpp -- Mon May 30 07:00:09 2022
Standard ProxySQL Cluster rev. 0.4.0906 -- ProxySQL_Cluster.cpp -- Mon May 30 07:00:09 2022
Standard ProxySQL Statistics rev. 1.4.1027 -- ProxySQL_Statistics.cpp -- Mon May 30 07:00:09 2022
Standard ProxySQL HTTP Server Handler rev. 1.4.1031 -- ProxySQL_HTTP_Server.cpp -- Mon May 30 07:00:09 2022
2022-06-10 17:11:36 [INFO] Using UUID: 9588556d-fc2d-48ac-9c48-201abab06768 . Writing it to database
2022-06-10 17:11:36 ProxySQL_Admin.cpp:6605:flush_mysql_variables___database_to_runtime(): [WARNING] Impossible to set not existing variable ping_interval_server with value "10000". Deleting. If the variable name is correct, this version doesn't support it
Standard ProxySQL Admin rev. 2.0.6.0805 -- ProxySQL_Admin.cpp -- Mon May 30 07:00:09 2022
2022-06-10 17:11:36 [INFO] ProxySQL SHA1 checksum: 760ce855664901607cd41b883b386bffda88b3f2
Standard MySQL Threads Handler rev. 0.2.0902 -- MySQL_Thread.cpp -- Mon May 30 07:00:09 2022
Standard MySQL Authentication rev. 0.2.0902 -- MySQL_Authentication.cpp -- Mon May 30 07:00:09 2022
2022-06-10 17:11:36 [INFO] Dumping mysql_servers_incoming
+--------------+-----------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+-------------+
| hostgroup_id | hostname | port | gtid_port | weight | status | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
+--------------+-----------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+-------------+
| 0 | 127.0.0.1 | 3306 | 0 | 1 | 0 | 0 | 200 | 0 | 0 | 0 | test server |
+--------------+-----------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+-------------+
2022-06-10 17:11:36 [INFO] Dumping mysql_servers LEFT JOIN mysql_servers_incoming
+-------------+--------------+----------+------+
| mem_pointer | hostgroup_id | hostname | port |
+-------------+--------------+----------+------+
+-------------+--------------+----------+------+
2022-06-10 17:11:36 [INFO] Dumping mysql_servers JOIN mysql_servers_incoming
+--------------+-----------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+-------------+-------------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+-------------+
| hostgroup_id | hostname | port | gtid_port | weight | status | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment | mem_pointer | gtid_port | weight | status | compression | max_connections | max_replication_lag | use_ssl | max_latency_ms | comment |
+--------------+-----------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+-------------+-------------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+-------------+
| 0 | 127.0.0.1 | 3306 | 0 | 1 | 0 | 0 | 200 | 0 | 0 | 0 | test server | 0 | 0 | 1 | 0 | 0 | 200 | 0 | 0 | 0 | test server |
+--------------+-----------+------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+-------------+-------------+-----------+--------+--------+-------------+-----------------+---------------------+---------+----------------+-------------+
2022-06-10 17:11:36 [INFO] Creating new server in HG 0 : 127.0.0.1:3306 , gtid_port=0, weight=1, status=0
2022-06-10 17:11:36 [INFO] New mysql_group_replication_hostgroups table
2022-06-10 17:11:36 [INFO] New mysql_galera_hostgroups table
2022-06-10 17:11:36 [INFO] New mysql_aws_aurora_hostgroups table
2022-06-10 17:11:36 [INFO] Checksum for table mysql_servers is 17518514293925156575
2022-06-10 17:11:36 [INFO] Checksum for table mysql_replication_hostgroups is 13209726424736073806
2022-06-10 17:11:36 [INFO] MySQL_HostGroups_Manager::commit() locked for 1ms
Standard Query Processor rev. 2.0.6.0805 -- Query_Processor.cpp -- Mon May 30 07:00:09 2022
In memory Standard Query Cache (SQC) rev. 1.2.0905 -- Query_Cache.cpp -- Mon May 30 07:00:09 2022
Standard MySQL Monitor (StdMyMon) rev. 2.0.1226 -- MySQL_Monitor.cpp -- Mon May 30 07:00:09 2022
2022-06-10 17:11:36 [INFO] For information about products and services visit: https://proxysql.com/
2022-06-10 17:11:36 [INFO] For online documentation visit: https://proxysql.com/documentation/
2022-06-10 17:11:36 [INFO] For support visit: https://proxysql.com/services/support/
2022-06-10 17:11:36 [INFO] For consultancy visit: https://proxysql.com/services/consulting/
2022-06-10 17:11:36 MySQL_Monitor.cpp:968:monitor_connect_thread(): [ERROR] Server 127.0.0.1:3306 is returning "Access denied" for monitoring user
2022-06-10 17:11:36 [INFO] Latest ProxySQL version available: 2.4.1-1-g1ea371d