Added template cnf file to /etc and renamed folders.

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Markus Makela
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# Galera Monitor
## Overview
The Galera Monitor is a monitoring module for MaxScale that monitors a Galera cluster. It detects whether nodes are a part of the cluster and if they are in sync with the rest of the cluster. It can also assign master and slave roles inside MaxScale, allowing Galera clusters to be used with modules designed for traditional master-slave clusters.
## Configuration
A minimal configuration for a monitor requires a set of servers for monitoring and a username and a password to connect to these servers. The user requires the REPLICATION CLIENT privilege to successfully monitor the state of the servers.
```
[Galera Monitor]
type=monitor
module=galeramon
servers=server1,server2,server3
user=myuser
passwd=mypwd
```
## Optional parameters for all monitors
Here are optional parameters that are common for all the monitors.
### `monitor_interval`
This is the time the monitor waits between each cycle of monitoring. The default value of 10000 milliseconds (10 seconds) should be lowered if you want a faster response to changes in the server states. The value is defined in milliseconds and the smallest possible value is 100 milliseconds.
```
monitor_interval=2500
```
### `backend_connect_timeout`
This parameter controls the timeout for connecting to a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 3 seconds.
```
backend_connect_timeout=6
```
### `backend_write_timeout`
This parameter controls the timeout for writing to a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 2 seconds.
```
backend_write_timeout=4
```
### `backend_read_timeout`
This parameter controls the timeout for reading from a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 1 seconds.
```
backend_read_timeout=2
```
## Galera Monitor optional parameters
These are optional parameters specific to the Galera Monitor.
### `disable_master_failback`
If a node marked as master inside MaxScale happens to fail and the master status is assigned to another node MaxScale will normally return the master status to the original node after it comes back up. With this option enabled, if the master status is assigned to a new node it will not be reassigned to the original node for as long as the new master node is running.
```
disable_master_failback=true
```
### `available_when_donor`
This option only has an effect if there is a single Galera node being backed up an XtraBackup instance. This causes the initial node to go into Donor state which would normally prevent if from being marked as a valid server inside MaxScale. If this option is enabled, a single node in Donor state where the method is XtraBackup will be kept in Synced state.
```
available_when_donor=true
```
### `disable_master_role_setting`
This disables the assignment of master and slave roles to the Galera cluster nodes. If this option is enabled, Synced is the only status assigned by this monitor.
```
disable_master_role_setting=true
```
### `script`
This script will be executed when a server changes its state. The parameter should be an absolute path to the script or it should be in the executable path.
```
script=/home/user/script.sh
```
### `events`
A list of event names which cause the script to be executed. If this option is not defined, all events cause the script to be executed. The list must contain a comma separated list of event names.
```
events=master_down,slave_down
```
## Script events
Here is a table of all possible event types and their descriptions.
Event Name|Description
----------|----------
master_down|A Master server has gone down
master_up|A Master server has come up
slave_down|A Slave server has gone down
slave_up|A Slave server has come up
server_down|A server with no assigned role has gone down
server_up|A server with no assigned role has come up
synced_down|A synced Galera node has come up
synced_up|A synced Galera node has gone down
lost_master|A server lost Master status
lost_slave|A server lost Slave status
lost_synced|A Galera node lost synced status
new_master|A new Master was detected
new_slave|A new Slave was detected
new_synced|A new synced Galera node was detected

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# Multi-Master Monitor
## Overview
The Multi-Master Monitor is a monitoring module for MaxScale that monitors Master-Master replication. It assigns master and slave roles inside MaxScale based on whether the read_only parameter on a server is set to off or on.
## Configuration
A minimal configuration for a monitor requires a set of servers for monitoring and a username and a password to connect to these servers. The user requires the REPLICATION CLIENT privilege to successfully monitor the state of the servers.
```
[Multi-Master Monitor]
type=monitor
module=mmmon
servers=server1,server2,server3
user=myuser
passwd=mypwd
```
## Optional parameters for all monitors
Here are optional parameters that are common for all the monitors.
### `monitor_interval`
This is the time the monitor waits between each cycle of monitoring. The default value of 10000 milliseconds (10 seconds) should be lowered if you want a faster response to changes in the server states. The value is defined in milliseconds and the smallest possible value is 100 milliseconds.
```
monitor_interval=2500
```
### `backend_connect_timeout`
This parameter controls the timeout for connecting to a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 3 seconds.
```
backend_connect_timeout=6
```
### `backend_write_timeout`
This parameter controls the timeout for writing to a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 2 seconds.
```
backend_write_timeout=4
```
### `backend_read_timeout`
This parameter controls the timeout for reading from a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 1 seconds.
```
backend_read_timeout=2
```
## Multi-Master Monitor optional parameters
These are optional parameters specific to the Multi-Master Monitor.
### `detect_stale_master`
Allow previous master to be available even in case of stopped or misconfigured replication. This allows services that depend on master and slave roles to continue functioning as long as the master server is available.
This is a situation which can happen if all slave servers are unreachable or the replication breaks for some reason.
```
detect_stale_master=true
```
### `script`
This script will be executed when a server changes its state. The parameter should be an absolute path to the script or it should be in the executable path.
```
script=/home/user/script.sh
```
This script will be called with the following command line arguments.
```
<name of the script> --event=<event type> --initiator=<server whose state changed> --nodelist=<list of all servers>
```
### `events`
A list of event names which cause the script to be executed. If this option is not defined, all events cause the script to be executed. The list must contain a comma separated list of event names.
```
events=master_down,slave_down
```
## Script events
Here is a table of all possible event types and their descriptions.
Event Name|Description
----------|----------
master_down|A Master server has gone down
master_up|A Master server has come up
slave_down|A Slave server has gone down
slave_up|A Slave server has come up
server_down|A server with no assigned role has gone down
server_up|A server with no assigned role has come up
lost_master|A server lost Master status
lost_slave|A server lost Slave status
new_master|A new Master was detected
new_slave|A new Slave was detected

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# MySQL Monitor
## Overview
The MySQL Monitor is a monitoring module for MaxScale that monitors a Master-Slave replication cluster. It assigns master and slave roles inside MaxScale according to the actual replication tree in the cluster.
## Configuration
A minimal configuration for a monitor requires a set of servers for monitoring and a username and a password to connect to these servers. The user requires the REPLICATION CLIENT privilege to successfully monitor the state of the servers.
```
[MySQL Monitor]
type=monitor
module=mysqlmon
servers=server1,server2,server3
user=myuser
passwd=mypwd
```
## Optional parameters for all monitors
Here are optional parameters that are common for all the monitors.
### `monitor_interval`
This is the time the monitor waits between each cycle of monitoring. The default value of 10000 milliseconds (10 seconds) should be lowered if you want a faster response to changes in the server states. The value is defined in milliseconds and the smallest possible value is 100 milliseconds.
```
monitor_interval=2500
```
### `backend_connect_timeout`
This parameter controls the timeout for connecting to a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 3 seconds.
```
backend_connect_timeout=6
```
### `backend_write_timeout`
This parameter controls the timeout for writing to a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 2 seconds.
```
backend_write_timeout=4
```
### `backend_read_timeout`
This parameter controls the timeout for reading from a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 1 seconds.
```
backend_read_timeout=2
```
## MySQL Monitor optional parameters
These are optional parameters specific to the MySQL Monitor.
### `detect_replication_lag`
Detect replication lag between the master and the slaves. This allows the routers to route read queries to only slaves that are up to date.
```
detect_replication_lag=true
```
### `detect_stale_master`
Allow previous master to be available even in case of stopped or misconfigured
replication. This allows services that depend on master and slave roles to continue functioning as long as the master server is available.
This is a situation which can happen if all slave servers are unreachable or the replication breaks for some reason.
```
detect_stale_master=true
```
### `script`
This script will be executed when a server changes its state. The parameter should be an absolute path to the script or it should be in the executable path.
```
script=/home/user/script.sh
```
This script will be called with the following command line arguments.
```
<name of the script> --event=<event type> --initiator=<server whose state changed> --nodelist=<list of all servers>
```
### `events`
A list of event names which cause the script to be executed. If this option is not defined, all events cause the script to be executed. The list must contain a comma separated list of event names.
```
events=master_down,slave_down
```
## Script events
Here is a table of all possible event types and their descriptions.
Event Name|Description
----------|----------
master_down|A Master server has gone down
master_up|A Master server has come up
slave_down|A Slave server has gone down
slave_up|A Slave server has come up
server_down|A server with no assigned role has gone down
server_up|A server with no assigned role has come up
lost_master|A server lost Master status
lost_slave|A server lost Slave status
new_master|A new Master was detected
new_slave|A new Slave was detected
## Example 1 - Monitor script
Here is an example shell script which sends an email to an admin when a server goes down.
```
#!/usr/bin/env bash
#This script assumes that the local mail server is configured properly
#The second argument is the event type
event=${$2/.*=/}
server=${$3/.*=/}
message="A server has gone down at `date`."
echo $message|mail -s "The event was $event for server $server." admin@my.org
```
Here is a monitor configuration that only triggers the script when a master or a slave server goes down.
```
[Database Monitor]
type=monitor
module=mysqlmon
servers=server1,server2
script=mail_to_admin.sh
events=master_down,slave_down
```
When a master or a slave server goes down, the script is executed, a mail is sent and the administrator will be immediately notified of any possible problems.
This is just a simple example showing what you can do with MaxScale and monitor scripts.

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# NDB Cluster Monitor
## Overview
The MySQL Cluster Monitor is a monitoring module for MaxScale that monitors a MySQL Cluster. It assigns a NDB status for the server if it is a part of a MySQL Cluster.
## Configuration
A minimal configuration for a monitor requires a set of servers for monitoring and a username and a password to connect to these servers. The user requires the REPLICATION CLIENT privilege to successfully monitor the state of the servers.
```
[MySQL Cluster Monitor]
type=monitor
module=ndbclustermon
servers=server1,server2,server3
user=myuser
passwd=mypwd
```
## Optional parameters for all monitors
Here are optional parameters that are common for all the monitors.
### `monitor_interval`
This is the time the monitor waits between each cycle of monitoring. The default value of 10000 milliseconds (10 seconds) should be lowered if you want a faster response to changes in the server states. The value is defined in milliseconds and the smallest possible value is 100 milliseconds.
```
monitor_interval=2500
```
### `backend_connect_timeout`
This parameter controls the timeout for connecting to a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 3 seconds.
```
backend_connect_timeout=6
```
### `backend_write_timeout`
This parameter controls the timeout for writing to a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 2 seconds.
```
backend_write_timeout=4
```
### `backend_read_timeout`
This parameter controls the timeout for reading from a monitored server. It is in seconds and the minimum value is 1 second. The default value for this parameter is 1 seconds.
```
backend_read_timeout=2
```
## MySQL Cluster Monitor optional parameters
These are optional parameters specific to the MySQL Cluster Monitor.
### `script`
This script will be executed when a server changes its state. The parameter should be an absolute path to the script or it should be in the executable path.
```
script=/home/user/script.sh
```
This script will be called with the following command line arguments.
```
<name of the script> --event=<event type> --initiator=<server whose state changed> --nodelist=<list of all servers>
```
### `events`
A list of event names which cause the script to be executed. If this option is not defined, all events cause the script to be executed. The list must contain a comma separated list of event names.
```
events=master_down,slave_down
```
## Script events
Here is a table of all possible event types and their descriptions that the MySQL Cluster monitor can be called with.
Event Name|Description
----------|----------
master_down|A Master server has gone down
master_up|A Master server has come up
slave_down|A Slave server has gone down
slave_up|A Slave server has come up
server_down|A server with no assigned role has gone down
server_up|A server with no assigned role has come up
ndb_down|A MySQL Cluster node has gone down
ndb_up|A MySQL Cluster node has come up
lost_master|A server lost Master status
lost_slave|A server lost Slave status
lost_ndb|A MySQL Cluster node lost node membership
new_master|A new Master was detected
new_slave|A new Slave was detected
new_ndb|A new MySQL Cluster node was found