Issues with clustercheck that is triggered via xinetd

MySQL & MariaDB Percona XtraDB Cluster 8.x
1

I have installed the xtradb cluster. All works great but now I want to add the failover capability using haproxy and clustercheck. I have run modified the clustercheck by adding extra_args=“–host=172.16.3.8” as the nodes is configured to listen on their private ip only.
when running the clustercheck from cli all works fine however when running it from xinetd it throws 503.

Any idea how to pinpoint the error that I am getting?

/usr/bin/clustercheck clustercheck clustercheckpassword!
HTTP/1.1 200 OK
Content-Type: text/plain
Connection: close
Content-Length: 40 

curl localhost:9200
Percona XtraDB Cluster Node is not synced or non-PRIM.

cat /etc/xinetd.d/mysqlchk 
# default: on
# description: mysqlchk
service mysqlchk
{
        disable = no
        flags = REUSE
        socket_type = stream
        port = 9200
        wait = no
        user = nobody
        server = /usr/bin/clustercheck
        server_args = clustercheck clustercheckpassword!
        log_on_success += USERID
        log_on_failure += USERID
        only_from = 0.0.0.0/0
        per_source = UNLIMITED
        log_type   = SYSLOG daemon debug
}

mysql -u clustercheck -h 172.16.3.8 -pclustercheckpassword! -e "show status like 'wsrep_local_state_comment'"
mysql: [Warning] Using a password on the command line interface can be insecure.
+---------------------------+--------+
| Variable_name             | Value  |
+---------------------------+--------+
| wsrep_local_state_comment | Synced |
+---------------------------+--------+

as can be seen the credentials are not issues.

2

Turn on xinetd debug logging and see what the logs say when you attempt to access it.

3

Also, xinetd is quite ancient. You should switch using modern systemd.