Comments - Readwritesplit

Hello,

I do steps here https://mariadb.com/kb/en/mariadb-enterprise/mariadb-maxscale-14/maxscale-readwrite-splitting-with-mysql-replication/

to setup maxscale 2.0 and I have in backend 2 MySQL 5.7 configured as master slave.

But maxscale can't detect master server and slave server; So when I try to connect through maxscale I got:

ERROR 1045 (28000): failed to create new session

and in error log:

Apr 16 20:55:13 docker maxscale[25981]: Couldn't find suitable Master from 2 candidates.
Apr 16 20:55:13 docker maxscale[25981]: Failed to create new router session for service 'Read-Write Service'. See previous errors for more details.

my config file:

[maxscale]
threads=2
[server1]
type=server
address=172.17.0.2
port=33061
protocol=MySQLBackend
authenticator_options=skip_authentication=true
router_options=master
[server2]
type=server
address=172.17.0.3
port=33062
protocol=MySQLBackend
authenticator_options=skip_authentication=true
router_options=slave
[Read-Write Service]
type=service
router=readwritesplit
#router=readconnroute
servers=server1,server2
user=myuser
passwd=mypwd
max_slave_connections=100%
#localhost_match_wildcard_host
enable_root_user=1
#detect_standalone_master
#failover
#router_options=slave_selection_criteria=LEAST_CURRENT_OPERATIONS
#max_slave_replication_lag=30
router_options=master_accept_reads=true
[MaxAdmin Service]
type=service
router=cli

[Read-Write Listener]
type=listener
service=Read-Write Service
protocol=MySQLClient
port=33060
socket=/tmp/maxadmin.sock
[MaxAdmin Listener]
type=listener
service=MaxAdmin Service
protocol=maxscaled
socket=default


[MySQL Monitor]
type=monitor
module=mysqlmon
servers=server1,server2
user=myuser
passwd=mypwd

root@docker:~# maxadmin list servers
Servers.
-------------------+-----------------+-------+-------------+--------------------
Server             | Address         | Port  | Connections | Status
-------------------+-----------------+-------+-------------+--------------------
server1            | 172.17.0.2      | 33061 |           0 | Running
server2            | 172.17.0.3      | 33062 |           0 | Running
-------------------+-----------------+-------+-------------+--------------------

But in all documentation I saw server1 status as Running, Master

Does the output of SHOW SLAVE STATUS show that replication is running properly?

yes it's running correctly

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: mysql
                  Master_User: repl
                  Master_Port: 33061
                Connect_Retry: 60
              Master_Log_File: mysql-node01.000016
          Read_Master_Log_Pos: 478
               Relay_Log_File: 1b69c4837339-relay-bin.000019
                Relay_Log_Pos: 697
        Relay_Master_Log_File: mysql-node01.000016
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 478
              Relay_Log_Space: 1976
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 1
                  Master_UUID: 3c9fbf8b-09bd-11e7-af8e-0242ac110002
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.00 sec)

and here mysql cnf file for master

root@docker:~# cat /root/docker/mysql-node01/conf.d/my-custom.cnf
[mysql]
port=33061
[mysqld]
port=33061
server-id=1
log-bin=mysql-node01
max_connections=1000
#innodb_buffer_pool_size=30M
binlog_format=mixed
max_allowed_packet=10M
report_host=172.17.0.3

slave:

root@docker:~# cat /root/docker/mysql-node02/conf.d/my-custom.cnf
[mysql]
port=33062
[mysqld]
port=33062
server-id=2
log-bin=mysql-node02
max_connections=1000
#innodb_buffer_pool_size=30M
binlog_format=mixed
read_only
max_allowed_packet=10M
read_only

Hello,

Eureka

GRANT REPLICATION CLIENT ON *.* TO 'myuser'@'%';

give maxscale user access to replica, and I had issue in maxscale logging so i didn't see the error in the log

Thank you.