Skip to content

ProxySQL Admin tool changes

Added features

  • New option --use-ssl to use SSL for connections between ProxySQL and the backend database servers

  • New option --max-transactions-behind to determine the maximum number of writesets that can be queued before the node is SHUNNED to avoid stale reads. The default value is 100

  • New operation --update-cluster to update the cluster membership by adding server nodes as found. (Note that nodes are added but not removed). The --writer-hg option may be used to specify which Galera hostgroup to update. The --remove-all-servers option instructs to remove all servers from the mysql_servers table before updating the cluster.

  • Hostgroups can be specified on the command-line: --writer-hg, --reader-hg, --backup-writer-hg, and --offline-hg. Previously, these host groups were only read from the configuration file.

  • The --enable and --update-cluster options used simultaneously have special meaning. If the cluster has not been enabled, then --enable is run. If the cluster has already been enabled, then --update-cluster is run.

  • New command --is-enabled to see if a cluster has been enabled. This command checks for the existence of a row in the mysql_Galera_hostgroups table. The --writer-hg option may be used to specify the writer hostgroup used to search the mysql_galera_hostgroups table.

  • New command --status to display Galera hostgroup information. This command lists all rows in the current mysql_galera_hostgroups table as well as all servers that belong to these hostgroups. With the --writer-hg option, only the information for the Galera hostgroup with that writer hostgroup is displayed.

  • New option --login-file reads login credentials from an encrypted file. If the --login-password or login-password-file options are not specified, the user is prompted for the password.

  • New option --login-password is the key used to decrypt the encrypted login-file. You cannot use the option with the --login-password-file.

  • New option --login-password-file reads the key from a file using the specified path. You cannot use the option with login-password.

Changed features

  • Setting --node-check-interval changes the ProxySQL global variable mysql-monitor_galera_healthcheck_interval. Note that this is a global variable, not a per-cluster variable.

  • The option --write-node takes only a single address as a parameter. In the singlewrite mode we only set the weight if --write-node specifies address:port. A priority list of addresses is no longer accepted.

  • The option --writers-as-readers option accepts a different set of values. The values of --writers-as-readers have been changed, due to changes in the behavior of ProxySQL between version 1.4 and version 2.0 related to Galera support. This option accepts the following values:

    Option Description
    yes Writers, backup-writers, and read-only nodes can act as readers.
    no Only read-only nodes can act as readers. Only read-only nodes can act as readers.
    backup Only backup-writers can act as readers.
  • The commands --syncusers, --sync-multi-cluster-users, --adduser, and --disable can use the --writer-hg option.

  • The command --disable removes all users associated with the Galera cluster hostgroups. Previously, this command only removed the users with the CLUSTER_APP_USERNAME.

  • The command --disable accepts the --writer-hg option to disable the Galera cluster associated with that hostgroup overriding the value specified in the configuration file.

Removed features

  • Asynchronous slave reader support has been removed: the --include-slaves option is not supported.

  • A list of nodes in the priority order is not supported in ProxySQL v2. Only a single node is supported at this time.

  • Since the galera_proxysql_checker and galera_node_monitor scripts are no longer run in the scheduler, automatic cluster membership updates are not supported.

  • Checking the pxc_maint_mode variable is no longer supported

  • Using desynced nodes if no other nodes are available is no longer supported.

  • The server status is no longer maintained in the mysql_servers table.

Limitations

  • With --writers-as-readers=backup read-only nodes are not allowed. This is a limitation of ProxySQL 2.x. Note that backup is the default value of --writers-as-readers when --mode=singlewrite

Get expert help

If you need assistance, visit the community forum for comprehensive and free database knowledge, or contact our Percona Database Experts for professional support and services.


Last update: 2024-09-12