Unable to login to the SolusVM Master web interface: after typing credentials the same login page is shown

Symptoms

1. Unable to login to the SolusVM Master web interface: after typing credentials the same login page is shown.

2. Lighttpd web server is used on the server:

   # service lighttpd status

3. Recently SolusVM was updated.

Cause

Old PHP packages are installed on the server.

Resolution

1. Connect to the SolusVM Master server over SSH.

2. Move you the current system PHP binary:

   # mv /usr/bin/php /usr/bin/backup-php

3. Create a link to SolusVM PHP binary:

   # ln -s /usr/local/svmstack/php/bin/php /usr/bin/php

4. Switch Lighttpd web server to Nginx:

   a) Install the SolusVM repository:

   # yum install solusvm-release

   b) Stop and disable Lighttpd web server:

   # service lighttpd stop
   # chkconfig lighttpd off

   c) Install Nginx web server and legacy configuration:

   # yum install svmstack-nginx svmstack-nginx-legacy-master-config

   d) Start services:

   # service svmstack-nginx restart
   # service svmstack-fpm restart

Note: on slave nodes, PHP binaries and web server also should be switched. Steps are the same, except for step "c":
# yum install svmstack-nginx svmstack-nginx-legacy-slave-config