db down and cannot restart or upgrade mem

db cluster just suddenly went down. Tried upgrading the memory to 512MB, but it’s just suck in ‘pending’ and won’t respond to restart requests or, well, anything.

restart responds with

 can't get role for 4161c615-785c-961e-ae48-beb0b5c21469: Get "http://:5500/commands/admin/role": dial: lookup : no such host

which is slightly concerning. Any advice?