Every now and then, often when I write a post on my Dreamhost DreamPress WordPress blog I get this Varnish related error:
Error 503 Service Unavailable
Service Unavailable
Guru Meditation:
XID: 180706672
Varnish cache server
I did a related post here https://serverfault.com/questions/576319/varnish-ispconfig-under-debian-give-error-503 but they only tell me it could be an Apache Virtual Hosts issue and that the defined hosts should be checked. But that thread was on a different XID and just a comment, not an accepted solution. So perhaps this situation is different. Any ideas?
Best Answer
Checking output of varnishlog may help to diagnose the exact issue causing this error. Since the logs are generated for every single request, you may want to direct logs to a text file and later look for 'Error 503 Service Unavailable' in text file.