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Percona Software for MySQL Documentation

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

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Last update: 2024-11-20