Enginetron : 502 Bad Gateway

Enginetron is a cpanel plugin which acts as a reverse proxy with apache to improve the server performance. There are certain cases where we get the following errors on the domain after installating enginetron.

502 Bad Gateway

In that case, you can use the following fix.
Open the file  /etc/nginx/custom_rules and add this at the bottom.

[root@server~]# vi /etc/nginx/custom_rules

if ($host ~ "domainname.com") {

set $PROXY_DOMAIN_OR_IP "xx.xx.xx.xx"; }

Domainname.com should be replaced by your domain and xx.xx.xx.xx should be replaced by your IP address.

OpenVZ/Ploop Error: required UB parameter

You might have noticed this error while creating a openvz VPS. These issues are mainly due to  the implementation of ploop in openvz kernel.

017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter kmemsize not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter lockedpages not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter privvmpages not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter shmpages not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter numproc not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter physpages not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter vmguarpages not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter oomguarpages not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter numtcpsock not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter numflock not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter numpty not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter numsiginfo not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter tcpsndbuf not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter tcprcvbuf not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter othersockbuf not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter dgramrcvbuf not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter numothersock not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter numfile not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter dcachesize not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: required UB parameter numiptent not set
2017-05-30T09:45:24+0100 vzctl : CT 154 : Error: failed to apply some parameters, not saving configuration file!


 You would need to install ploop and enable it on your hardware node and solusvm node configurations.
1. yum install ploop
2, /scripts/upcp  on solusvm master
3. Solusvm node configuration