Fixes #17: Allow configuration of mysql slow query log.

README.md

@@ -53,10 +53,17 @@ The MySQL users and their privileges. A user has the values `name`, `host` (defa
 
 Default MySQL connection configuration.
 
+    mysql_log: ""
     mysql_log_error: /var/log/mysqld.log
     mysql_syslog_tag: mysqld
 
-MySQL logging configuration. Setting `mysql_log_error` to `syslog` will make MySQL log to syslog using the `mysql_syslog_tag`.
+MySQL logging configuration. Setting `mysql_log` (the general query log) or `mysql_log_error` to `syslog` will make MySQL log to syslog using the `mysql_syslog_tag`.
+
+    mysql_slow_query_log_enabled: no
+    mysql_slow_query_log_file: /var/log/mysql-slow.log
+    mysql_slow_query_time: 2
+
+Slow query log settings. Note that the log file will be created by this role, but if you're running on a server with SELinux or AppArmor, you may need to add this path to the allowed paths for MySQL, or disable the mysql profile. For example, on Debian/Ubuntu, you can run `sudo ln -s /etc/apparmor.d/usr.sbin.mysqld /etc/apparmor.d/disable/usr.sbin.mysqld && sudo service apparmor restart`.
 
     mysql_key_buffer_size: "256M"
     mysql_max_allowed_packet: "64M"

defaults/main.yml

@@ -24,6 +24,11 @@ mysql_port: "3306"
 mysql_bind_address: '0.0.0.0'
 mysql_datadir: /var/lib/mysql
 
+# Slow query log settings.
+mysql_slow_query_log_enabled: no
+mysql_slow_query_log_file: /var/log/mysql-slow.log
+mysql_slow_query_time: 2
+
 # Memory settings (default values optimized ~512MB RAM).
 mysql_key_buffer_size: "256M"
 mysql_max_allowed_packet: "64M"
@@ -56,8 +61,9 @@ mysql_innodb_lock_wait_timeout: 50
 mysql_mysqldump_max_allowed_packet: "64M"
 
 # Logging settings.
-mysql_log_error: /var/log/mysqld.log
-mysql_syslog_tag: mysqld
+mysql_log: ""
+mysql_log_error: /var/log/mysql.err
+mysql_syslog_tag: mysql
 
 # Databases.
 mysql_databases: []

tasks/configure.yml

@@ -9,5 +9,18 @@
     force: "{{ overwrite_global_mycnf }}"
   notify: restart mysql
 
+- name: Create slow query log file (if configured).
+  shell: "touch {{ mysql_slow_query_log_file }} creates={{ mysql_slow_query_log_file }}"
+  when: mysql_slow_query_log_enabled
+
+- name: Set ownership on slow query log file (if configured).
+  file:
+    path: "{{ mysql_slow_query_log_file }}"
+    state: file
+    owner: mysql
+    group: mysql
+    mode: 0644
+  when: mysql_slow_query_log_enabled
+
 - name: Ensure MySQL is started and enabled on boot.
   service: "name={{ mysql_daemon }} state=started enabled={{ mysql_enabled_on_startup }}"

templates/my.cnf.j2

@@ -9,6 +9,25 @@ bind-address = {{ mysql_bind_address }}
 datadir = {{ mysql_datadir }}
 socket = {{ mysql_socket }}
 
+# Logging configuration.
+{% if mysql_log_error == 'syslog' or mysql_log == 'syslog' %}
+syslog
+syslog-tag = {{ mysql_syslog_tag }}
+{% else %}
+{% if mysql_log %}
+log = {{ mysql_log }}
+{% endif %}
+log-error = {{ mysql_log_error }}
+{% endif %}
+
+{% if mysql_slow_query_log_enabled %}
+# Slow query log configuration.
+log_slow_queries = 1
+slow_query_log = 1
+slow_query_log_file = {{ mysql_slow_query_log_file }}
+long_query_time = {{ mysql_slow_query_time }}
+{% endif %}
+
 {% if mysql_replication_master %}
 # Replication
 server-id = {{ mysql_server_id }}
@@ -38,7 +57,7 @@ relay-log-index = relay-bin.index
 # Disabling symbolic-links is recommended to prevent assorted security risks
 symbolic-links = 0
 
-# User is ignored when systemd is used (fedora <= 15).
+# User is ignored when systemd is used (fedora >= 15).
 user = mysql
 
 # http://dev.mysql.com/doc/refman/5.5/en/performance-schema.html
@@ -57,7 +76,6 @@ query_cache_size = {{ mysql_query_cache_size }}
 
 # Other settings.
 wait_timeout = {{ mysql_wait_timeout }}
-max_allowed_packet = {{ mysql_max_allowed_packet }}
 
 # Try number of CPU's * 2 for thread_concurrency.
 thread_concurrency = {{ mysql_thread_concurrency }}
@@ -76,11 +94,4 @@ quick
 max_allowed_packet = {{ mysql_mysqldump_max_allowed_packet }}
 
 [mysqld_safe]
-{% if mysql_log_error == 'syslog' %}
-syslog
-syslog-tag = {{ mysql_syslog_tag }}
-{% else %}
-skip-syslog
-log-error = {{ mysql_log_error }}
-{% endif %}
 pid-file = /var/run/mysqld/mysqld.pid