Server interactions page template
Use this template, for me it proved to be a great help in diagnosing problems involving server interactions.
Format is simple: for every server involved create a header and under this header write down all the external connections this server makes.
Format
Format for connections is the following:
daemon: --> remoteserver/daemod: <portnumber>/protocol
balancer.site
ngnix: --> webserver0.site/ngnix: 80/tcp ngnix: --> webserver1.site/ngnix: 80/tcp
webserver0.site
php-fpm: --> sql.site/postgresql: 5423/tcp
webserver1.site
php-fpm: --> sql.site/postgresql: 5423/tcp
sql.site
postgresql: --> backup.sql.site/postgresql: 22/tcp
backup.sql.site
amanda.site
amanda-server: --> balancer.site/amanda-client: 30000-30100/tcp, 10800/udp amanda-server: --> webserver0.site/amanda-client: 30000-30100/tcp, 10800/udp amanda-server: --> sql.site/amanda-client: 30000-30100/tcp, 10800/udp
zabbix.site
zabbix-server: --> balancer.site/zabbix-agent: 10050/tcp zabbix-server: --> webserver0.site/zabbix-agent: 10050/tcp zabbix-server: --> webserver1.site/zabbix-agent: 10050/tcp zabbix-server: --> sql.site/zabbix-agent: 10050/tcp zabbix-server: --> backup.sql.site/zabbix-agent: 10050/tcp zabbix-server: --> amanda.site/zabbix-agent: 10050/tcp
