maxcrtl 无法连接到 maxscale

Question

I have a k8s cluster on which I want to deploy the MariaDB cluster. I have master and slave pods and want to monitor them with a maxscale. The pod runs with its default config without any problem, but when I mount the volume in a type of configmap and run maxctrl list servers I get the below error:

Error: Could not connect to MaxScale

The logs of the pod:

maxscale log

Deployment file:

 --- apiVersion: apps/v1 kind: Deployment metadata: name: maxscale namespace: mariaDB-cluster spec: replicas: 2 selector: matchLabels: app: maxscale template: metadata: labels: app: maxscale spec: containers: - name: maxscale image: mariadb/maxscale:6.3.1 volumeMounts: - name: maxscale mountPath: /etc/maxscale.cnf.d/ ports: - name: mariadb containerPort: 3306 - name: restapi containerPort: 8989 volumes: - name: maxscale configMap: name: maxscale-test items: - key: "maxscale.cnf" path: "maxscale.cnf"

Configmap.yaml:

 apiVersion: v1 kind: ConfigMap metadata: name: maxscale-test namespace: mariadb-cluster labels: app: maxscale app.kubernetes.io/name: maxscale data: maxscale.cnf: | [maxscale] threads=auto admin_enabled=false # Server definitions # # Set the address of the server to the network # address of a MariaDB server. # [server1] type=server address=127.0.0.1 port=3306 protocol=MariaDBBackend # Monitor for the servers # # This will keep MaxScale aware of the state of the servers. # MariaDB Monitor documentation: # https://mariadb.com/kb/en/maxscale-6-monitors/ [MariaDB-Monitor] type=monitor module=mariadbmon servers=server1 user=myuser password=mypwd monitor_interval=2000 # Service definitions # # Service Definition for a read-only service and # a read/write splitting service. # # ReadConnRoute documentation: # https://mariadb.com/kb/en/mariadb-maxscale-6-readconnroute/ [Read-Only-Service] type=service router=readconnroute servers=server1 user=myuser password=mypwd router_options=slave # ReadWriteSplit documentation: # https://mariadb.com/kb/en/mariadb-maxscale-6-readwritesplit/ [Read-Write-Service] type=service router=readwritesplit servers=server1 user=myuser password=mypwd # Listener definitions for the services # # These listeners represent the ports the # services will listen on. # [Read-Only-Listener] type=listener service=Read-Only-Service protocol=MariaDBClient port=4008 [Read-Write-Listener] type=listener service=Read-Write-Service protocol=MariaDBClient port=4006

I use the maxscale default config, but it does not work when I mount it to /etc/maxscale.cnf.d, so I think the problem is related to reading the config file.

Answer 1

Make sure to run the command inside the same container that the maxscale process is running on: by default it listens only for local connections on port 8989. If you want MaxScale to listen on all interfaces, not just the loopback interface, use admin_host=0.0.0.0 .

If you expose the REST API port of the container and want to connect to it from outside, use maxctrl -h address:port . The address is the network address ( admin_host in maxscale.cnf ) and port is the network port it listens on ( admin_port in maxctrl.cnf ).

For example, to connect to a MaxScale container at mxshost :

maxctrl -h mxshost:8989 list servers

Answer 2

i found the answer. It was about the conflict in maxscale config. i add a new config in maxscale.cnf and mount it to /etc/maxscale.cnf.d/. but I think this config was appended to /etc/maxscale.cnf, so when I have the below part in /etc/maxscale.cnf.d/maxscale.cnf again, it makes conflict:

[maxscale]
    threads=auto
    admin_enabled=false

So I deleted this part from my configmap, and it worked.