Setting up MaxScale read/write split routing with MySQL - mysql

Question

I am attempting to setup MaxScale read/write split routing with MySQL.
My vagrant setup is as follows:
Vagrant.configure(2) do |config|
config.vm.box = "ubuntu/trusty64"
config.vm.define 'maxscale' do |haproxy_instance|
haproxy_instance.vm.provision "shell", path: 'provision_maxscale.sh'
haproxy_instance.vm.network "forwarded_port", guest: 80, host: 9901
haproxy_instance.vm.network "forwarded_port", guest: 3306, host: 9906
haproxy_instance.vm.network 'private_network', ip: '192.168.50.101'
end
config.vm.define 'mysql-primary' do |mysql_primary_instance|
mysql_primary_instance.vm.provision "shell", path: 'provision_mysql_primary.sh'
mysql_primary_instance.vm.network "forwarded_port", guest: 3306, host: 9907
mysql_primary_instance.vm.network 'private_network', ip: '192.168.50.100'
end
config.vm.define 'mysql-slave' do |mysql_slave_instance|
mysql_slave_instance.vm.provision "shell", path: 'provision_mysql_primary.sh'
mysql_slave_instance.vm.network "forwarded_port", guest: 3306, host: 9908
mysql_slave_instance.vm.network 'private_network', ip: '192.168.50.99'
end
end
provision_maxscale.sh :
wget https://downloads.mariadb.com/enterprise/pbc3-8y0m/generate/10.0/mariadb-enterprise-repository.deb
dpkg -i mariadb-enterprise-repository.deb
sudo apt-get update
sudo apt-get --force-yes --yes install maxscale
sudo systemctl start maxscale.service
cp /vagrant/maxscale.cnf /etc/maxscale.cnf
sudo systemctl start maxscale.service
sudo service maxscale stop
sudo service maxscale start
maxscale.cnf :
[maxscale]
threads=4
[qla]
type=filter
module=qlafilter
options=/tmp/QueryLog
[fetch]
type=filter
module=regexfilter
match=fetch
replace=select
[RW]
type=service
localhost_match_wildcard_host=1
router=readwritesplit
servers=server1,server2
user=lorefnon
passwd=password
max_slave_connections=100%
router_options=slave_selection_criteria=LEAST_CURRENT_OPERATIONS
[RR]
type=service
localhost_match_wildcard_host=1
router=readconnroute
router_options=synced
servers=server1,server2
user=lorefnon
passwd=password
[Debug Interface]
type=service
router=debugcli
[CLI]
type=service
router=cli
[RWlistener]
type=listener
service=RW
protocol=MySQLClient
# address=10.69.179.54
port=3307
[RRlistener]
type=listener
service=RR
protocol=MySQLClient
# address=10.69.179.54
port=3308
[Debug Listener]
type=listener
service=Debug Interface
protocol=telnetd
address=127.0.0.1
port=4442
[CLI Listener]
type=listener
service=CLI
protocol=maxscaled
address=127.0.0.1
port=6603
[server1]
type=server
address=192.168.50.100
port=3306
protocol=MySQLBackend
[server2]
type=server
address=192.168.50.99
port=3306
protocol=MySQLBackend
The provisioners for setting up mysql replications are taken from this article. And I have verified that replication is functional and the maxscale instance can connect to each of the two mysql instances.
The following error message appears when I try to connect to the split router:
mysql -u lorefnon -p -P3307 -h 127.0.0.1
-----------------------------------------------------------------------
MariaDB Corporation MaxScale /var/log/maxscale/error1.log Sat Nov 28 11:38:02 2015
-----------------------------------------------------------------------
--- Logging is enabled.
2015-11-28 11:38:13 Error : Couldn't find suitable Master from 2 candidates.
2015-11-28 11:38:13 Error : Failed to create RW session.
Any help regarding figuring out the problem, or even pointing to where I can investigate why a suitable candidate is not being found is highly appreciated.

Answer 1

for me the most important information is missing or too abstract (how you really configured your database servers).
When I had these kind of issues the slave wasn't configured properly as slave (means no master was set).
What happens when you execute:
show slave status
Could it be, that you missed to execute https://mariadb.com/kb/en/library/change-master-to/