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46 lines
1.3 KiB
Markdown
46 lines
1.3 KiB
Markdown
# Multi-Master Monitor
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## Overview
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The Multi-Master Monitor is a monitoring module for MaxScale that monitors Master-Master replication.
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It assigns master and slave roles inside MaxScale based on whether the read_only parameter on a server
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is set to off or on.
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## Configuration
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A minimal configuration for a monitor requires a set of servers for monitoring and an username
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and a password to connect to these servers. The user requires the REPLICATION CLIENT privilege
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to successfully monitor the state of the servers.
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```
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[Multi-Master Monitor]
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type=monitor
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module=mmmon
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servers=server1,server2,server3
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user=myuser
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passwd=mypwd
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```
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## Common Monitor Parameters
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For a list of optional parameters that all monitors support, read
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the [Monitor Common](Monitor-Common.md) document.
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## Multi-Master Monitor optional parameters
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These are optional parameters specific to the Multi-Master Monitor.
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### `detect_stale_master`
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Allow previous master to be available even in case of stopped or misconfigured replication.
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This allows services that depend on master and slave roles to continue functioning as long as
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the master server is available.
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This is a situation which can happen if all slave servers are unreachable or the
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replication breaks for some reason.
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```
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detect_stale_master=true
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```
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