I assume you have read Setting up MySQL Router before reading this.
So we start our First example with the config file used in Setting up MySQL Router sample-router.ini
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[logger] level = INFO [routing:read_only] bind_address = localhost bind_port = 7001 destinations = localhost:13002,localhost:13003,localhost:13004 mode = read-only [routing:read_write] bind_address = localhost bind_port = 7002 destinations = localhost:13005,localhost:13006 mode = read-write |
About different mode options :
[routing:read_only] :
If you connect a client to read-only routing service i.e. port 7001 , router will redirect the first connection to the first available server in the list, i.e. 13002. If you connect another client to the same bind_port, router will redirect the connection to the next available server in the list, i.e. 13003. another client request to same bind port will be redirected to next available server in the list , i.e 13004 and then router goes back to 13002.
So, when “mode = read-only” , client connection requests will be served in round-robin fashion. If next available server in the configured list in not available (may be its not running or its down), then following available server will be considered to serve the client requests.
[routing:read_write] :
If you connect a client to read-write routing service i.e. port 7002 , router will always redirect the connection to the first available server in the list, i.e. 13005. If you connect another client to the same bind_port, router will again redirect the connection to first available server in the list, i.e. 13005.
So, when “mode = read-write” , always first available server will be returned to the client. If the first available server in the configured list is not available (may be its not running or its down), then next available server in the list will be considered to serve the client requests.
About bind_address and bind_port :
Bind address is an optional parameter ,if you don’t set it 127.0.0.1 will be assumed. bind_port is a mandatory config parameter, not specifying this will throw an error during the router start. Also a single bind_port can be used for multiple bind_address values.
For Example :
bind_address = localhost
bind_port = 7002
Now we start our Second Example with the <tar-package>/share/doc/mysqlrouter/sample_mysqlrouter.ini file which is part of the downloaded package :
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[DEFAULT] logging_folder = plugin_folder = /usr/local/lib/mysqlrouter config_folder = /etc/mysql runtime_folder = /var/run [logger] level = INFO [fabric_cache] address = your_fabric_node.example.com:32275 user = [routing:basic_failover] bind_port = 7001 mode = read-write destinations = mysql-server1:3306,mysql-server2 [routing:homepage_reads_fabric] bind_port = 7002 destinations = fabric+cache:///group/homepage_group?allow_primary_reads=yes mode = read-only |
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Hi, I’m configuring MySQL Router with fabric, and seems to work fine, my only question is, how can I start MySQL Router and leave running even when I log off from the server? The only way I can start it is with
mysqlrouter –config=/etc/mysqlrouter/mysqlrouter.ini
So I can put my password, but then the router will only works with that connection established, is there a workaround?
Thanks
Hi Mauricio,
I would strongly encourage you to try out InnoDB clusters if you haven’t yet:
– http://mysqlserverteam.com/mysql-innodb-cluster-new-5-7-17-preview-release-on-labs-mysql-com/
– http://mysqlserverteam.com/mysql-innodb-cluster-a-hands-on-tutorial/
That being said, this is how I had previously setup MySQL Router 2.0 to run as a daemon on my test machines–which are systemd (EL7) based–so that you have a working reference implementation. In this test setup, the username:password combination for Fabric was
admin:admin
[root@hanode1 ~]# cat /etc/mysqlrouter/mysqlrouter.ini
#
# MySQL Router configuration file
#
# Documentation is available at
# http://dev.mysql.com/doc/mysql-router/en/
[DEFAULT]
logging_folder = /var/log/mysqlrouter/
plugin_folder = /usr/lib64/mysqlrouter
runtime_folder = /var/run/mysqlrouter
config_folder = /etc/mysqlrouter
[fabric_cache:lab]
address = 192.168.1.91
user = admin
# Routing into my Fabric managed cluster
# route to the current READ_WRITE / PRIMARY node
[routing:lab]
bind_address = 127.0.0.1:6600
destinations = fabric+cache://lab/group/hagroup
mode = read-write
# Routing into my Group Replication cluster
# route to the first available node
[routing:grouprepl]
bind_address = 127.0.0.1:7700
destinations = 192.168.1.92:3306,192.168.1.93:3306,192.168.1.94:3306
mode = read-write
[logger]
level = debug
[root@hanode1 ~]# cat /usr/lib/systemd/system/mysqlrouter.service
[Unit]
Description=MySQL Router
After=syslog.target
After=network.target
After=mysqlfabric.service
[Service]
Type=simple
User=mysql
Group=mysql
PIDFile=/var/run/mysqlrouter/mysqlrouter.pid
ExecStart=/bin/bash -c "echo 'admin' | mysqlrouter --config=/etc/mysqlrouter/mysqlrouter.ini"
Restart=on-failure
RestartPreventExitStatus=1
PrivateTmp=true
[Install]
WantedBy=multi-user.target
[root@hanode1 ~]#
Best Regards,
Matt
Hi Matt. Thanks a lot, yesterday I’ve thought something similiar, starting it like mysqlrouter < pass.txt but this is better, because I'll be able to use the service. About InnoDB Cluster sadly we're still in MySQL 5.6, besides we use MyISAM tables occasionally.
Thanks again for your answer.
Mauricio
Hi,
Thanks for the article.
MySQL router cannot figure out when server(s) was(were) recovered after restart/shutdown/etc.
It gives “Can’t connect to MySQL server” even when all the servers already UP.
Any idea?
Thanks,
John
Thanks For this clarification, But i don’t know how i connect my Php Application to the router. As it defines two port one is for read and other is for read and write.
Now the issue in i have developed an application and need to connect with Cluster but how.
My application is written in PHP using Yii2 Application.