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MXS-406: documentation update for Galera monitor

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The galera monitor has a new option: set_donor_nodes
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MassimilianoPinto
2017-01-18 09:46:20 +01:00
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Documentation/Monitors/Galera-Monitor.md
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@ -76,6 +76,32 @@ If the `root_node_as_master` option is disabled for galeramon, the node with the
lowest index will always be chosen as the master. If it is enabled, only the lowest index will always be chosen as the master. If it is enabled, only the
node with a a _wsrep_local_index_ value of 0 can be chosed as the master. node with a a _wsrep_local_index_ value of 0 can be chosed as the master.
### `set_donor_nodes`
This option controls whether the global variable _wsrep_sst_donor_ should be set
in each cluster node with _slave' status_.
The variable contains a list of slave servers, automatically sorted, with
possible master candidates at its end.
The sorting is based either on _wsrep_local_index_ or node server _priority_
depending on the value of _use_priority_ option.
If no server has _priority_ defined the sorting switches to _wsrep_local_index_.
Node names are collected by fetching the result of the variable _wsrep_node_name_.
Example of variable being set in all slave nodes, assuming three nodes:
```
SET GLOBAL wsrep_sst_donor = "galera001,galera000"
```
**Note**:
in order to set the global variable _wsrep_sst_donor_, proper privileges are
required for the monitor user that connects to cluster nodes.
This option is disabled by default and was introduced in MaxScale 2.1.0.
```
set_donor_nodes=true
```
## Interaction with Server Priorities ## Interaction with Server Priorities
If the `use_priority` option is set and a server is configured with the If the `use_priority` option is set and a server is configured with the