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Clean up connection routing tutorials

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Wrapped lines to 80 characters, fixed minor differences and reworded
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Markus Mäkelä
2018-03-09 11:04:54 +02:00
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Documentation/Tutorials/Galera-Cluster-Connection-Routing-Tutorial.md
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@ -2,43 +2,41 @@
# Environment & Solution Space
The object of this tutorial is to have a system that has two ports available, one for
write connections to the database cluster and the other for read connections to the database.
The object of this tutorial is to have a system that has two ports available,
one for write connections to the database cluster and the other for read
connections to the database.
## Setting up MariaDB MaxScale
The first part of this tutorial is covered in [MariaDB MaxScale Tutorial](MaxScale-Tutorial.md).
Please read it and follow the instructions for setting up MariaDB MaxScale with the
type of cluster you want to use.
Please read it and follow the instructions for setting up MariaDB MaxScale with
the type of cluster you want to use.
Once you have MariaDB MaxScale installed and the database users created, we can create
the configuration file for MariaDB MaxScale.
Once you have MariaDB MaxScale installed and the database users created, we can
create the configuration file for MariaDB MaxScale.
## Creating Your MariaDB MaxScale Configuration
MariaDB MaxScale configuration is held in an ini file that is located in the file maxscale.cnf
in the directory /etc, if you have installed in the default location then this file
is available in /etc/maxscale.cnf. This is not created as part of the installation process
and must be manually created. A template file does exist within the /usr/share/maxscale directory
that may be use as a basis for your configuration.
MariaDB MaxScale reads its configuration from `/etc/maxscale.cnf`. A template
configuration is provided with the MaxScale installation.
A global, maxscale, section is included within every MariaDB MaxScale configuration file;
this is used to set the values of various MariaDB MaxScale wide parameters, perhaps
the most important of these is the number of threads that MariaDB MaxScale will use
to execute the code that forwards requests and handles responses for clients.
A global, `[maxscale]`, section is included within every MariaDB MaxScale
configuration file; this is used to set the values of various MariaDB MaxScale
wide parameters, perhaps the most important of these is the number of threads
that MariaDB MaxScale will use to handle client requests.
```
[maxscale]
threads=4
```
Since we are using Galera Cluster and connection routing we want a single to which
the client application can connect; MariaDB MaxScale will then route connections to
this port onwards to the various nodes within the Galera Cluster. To achieve this
within MariaDB MaxScale we need to define a service in the ini file. Create a section
for each in your MariaDB MaxScale configuration file and set the type to service,
the section name is the names of the service and should be meaningful to
the administrator. Names may contain whitespace.
Since we are using Galera Cluster and connection routing we want a single to
which the client application can connect; MariaDB MaxScale will then route
connections to this port onwards to the various nodes within the Galera
Cluster. To achieve this within MariaDB MaxScale we need to define a service in
the ini file. Create a section for each in your MariaDB MaxScale configuration
file and set the type to service, the section name is the names of the service
and should be meaningful to the administrator. Names may contain whitespace.
```
[Galera Service]
@ -46,9 +44,9 @@ type=service
```
The router for this section the readconnroute module, also the service should be
provided with the list of servers that will be part of the cluster. The server names
given here are actually the names of server sections in the configuration file and not
the physical hostnames or addresses of the servers.
provided with the list of servers that will be part of the cluster. The server
names given here are actually the names of server sections in the configuration
file and not the physical hostnames or addresses of the servers.
```
[Galera Service]
@ -57,12 +55,13 @@ router=readconnroute
servers=dbserv1, dbserv2, dbserv3
```
In order to instruct the router to which servers it should route we must add router
options to the service. The router options are compared to the status that the monitor
collects from the servers and used to restrict the eligible set of servers to which that
service may route. In our case we use the option that restricts us to servers that are
fully functional members of the Galera cluster which are able to support SQL operations
on the cluster. To achieve this we use the router option synced.
In order to instruct the router to which servers it should route we must add
router options to the service. The router options are compared to the status
that the monitor collects from the servers and used to restrict the eligible set
of servers to which that service may route. In our case we use the option that
restricts us to servers that are fully functional members of the Galera cluster
which are able to support SQL operations on the cluster. To achieve this we use
the router option synced.
```
[Galera Service]
@ -72,29 +71,28 @@ router_options=synced
servers=dbserv1, dbserv2, dbserv3
```
The final step in the service section is to add the username and password that will be
used to populate the user data from the database cluster. There are two options for
representing the password, either plain text or encrypted passwords may be used.
In order to use encrypted passwords a set of keys must be generated that will be used
by the encryption and decryption process. To generate the keys use the maxkeys command
and pass the name of the secrets file in which the keys are stored.
The final step in the services section is to add the username and password that
will be used to populate the user data from the database cluster. There are two
options for representing the password, either plain text or encrypted passwords
may be used. In order to use encrypted passwords a set of keys must be
generated that will be used by the encryption and decryption process. To
generate the keys use the `maxkeys` command and pass the name of the secrets
file in which the keys are stored.
```
% maxkeys /var/lib/maxscale/.secrets
%
maxkeys /var/lib/maxscale/.secrets
```
Once the keys have been created the maxpasswd command can be used to generate
the encrypted password.
```
% maxpasswd plainpassword
maxpasswd plainpassword
96F99AA1315BDC3604B006F427DD9484
%
```
The username and password, either encrypted or plain text, are stored in the service
section using the user and passwd parameters.
The username and password, either encrypted or plain text, are stored in the
service section using the user and passwd parameters.
```
[Galera Service]
@ -106,12 +104,12 @@ user=maxscale
passwd=96F99AA1315BDC3604B006F427DD9484
```
This completes the definitions required by the service, however listening ports must
be associated with a service in order to allow network connections. This is done by
creating a series of listener sections. These sections again are named for the convenience
of the administrator and should be of type listener with an entry labeled service which
contains the name of the service to associate the listener with.
Each service may have multiple listeners.
This completes the definitions required by the services, however listening ports
must be associated with the services in order to allow network connections. This
is done by creating a series of listener sections. These sections again are
named for the convenience of the administrator and should be of type listener
with an entry labeled service which contains the name of the service to
associate the listener with. Each service may have multiple listeners.
```
[Galera Listener]
@ -131,27 +129,27 @@ protocol=MariaDBClient
port=4306
```
An address parameter may be given if the listener is required to bind to a particular
network address when using hosts with multiple network addresses.
The default behavior is to listen on all network interfaces.
An address parameter may be given if the listener is required to bind to a
particular network address when using hosts with multiple network addresses. The
default behavior is to listen on all network interfaces.
## Configuring the Monitor and Servers
The next step is the configuration of the monitor and the servers that the
service uses. This is process described in the
[Configuring Galera Monitor](Configuring-Galera-Monitor.md)
document.
[Configuring Galera Monitor](Configuring-Galera-Monitor.md) document.
## Configuring the Administrative Interface
The final stage in the configuration is to add the option service which is used by
the maxadmin command to connect to MariaDB MaxScale for monitoring and
The final stage in the configuration is to add the option service which is used
by the maxadmin command to connect to MariaDB MaxScale for monitoring and
administration purposes. This creates a service section and a listener section.
```
[CLI]
type=service
router=cli
[CLI Listener]
type=listener
service=CLI
@ -162,26 +160,25 @@ socket=default
## Starting MariaDB MaxScale
Upon completion of the configuration process MariaDB MaxScale is ready to be
started for the first time. This may either be done manually by running the
maxscale command or via the service interface.
started for the first time. For newer systems that use systemd, use the _systemctl_ command.
```
% maxscale
sudo systemctl start maxscale
```
or
For older SysV systems, use the _service_ command.
```
% service maxscale start
sudo service maxscale start
```
Check the error log in /var/log/maxscale to see if any errors are detected in
the configuration file and to confirm MariaDB MaxScale has been started.
Also the maxadmin command may be used to confirm that MariaDB MaxScale is running
and the services, listeners etc have been correctly configured.
If MaxScale fails to start, check the error log in `/var/log/maxscale/` to see
if any errors are detected in the configuration file. The `maxadmin` command may
be used to confirm that MariaDB MaxScale is running and the services, listeners
etc have been correctly configured.
```
% maxadmin list services
% sudo maxadmin list services
Services.
--------------------------+----------------------+--------+---------------
@ -190,7 +187,7 @@ Service Name | Router Module | #Users | Total Sessions
Galera Service | readconnroute | 1 | 1
CLI | cli | 2 | 2
--------------------------+----------------------+--------+---------------
% maxadmin list servers
% sudo maxadmin list servers
Servers.
-------------------+-----------------+-------+-------------+-------------------
Server | Address | Port | Connections | Status
@ -211,7 +208,7 @@ mechanism of the Galera Monitor module. For more details,
read the [Galera Monitor](../Monitors/Galera-Monitor.md) documentation.
```
% maxadmin list listeners
% sudo maxadmin list listeners
Listeners.
---------------------+--------------------+-----------------+-------+--------
@ -224,9 +221,9 @@ CLI | maxscaled | localhost | 6603 | Running
```
MariaDB MaxScale is now ready to start accepting client connections and routing
them to the master or slaves within your cluster. Other configuration options are
available that can alter the criteria used for routing, such as using weights to
obtain unequal balancing operations.
These options may be found in the MariaDB MaxScale Configuration Guide.
More detail on the use of maxadmin can be found in the document
["MaxAdmin - The MariaDB MaxScale Administration & Monitoring Client Application"](../Reference/MaxAdmin.md).
them to the cluster. More options may be found in the
[Configuration Guide](../Getting-Started/Configuration-Guide.md)
and in the router module documentation.
More detail on the use of `maxadmin` can be found in the
[MaxAdmin](../Reference/MaxAdmin.md) document.