Confluence crashes (503 from apache) after several days of normal behaviour

[Danny Barthaud]

My confluence instance seems to crash every few days and I can find no reason for it in the logs. Apache continues to serve other sites on the server without issue. In the atlassian-confluence.log file there are some errors regarding the "messagebundle"

2017-10-13 21:45:30,530 ERROR [http-nio-8090-exec-6] [renderer.internal.http.HttpClientFetcher] fetch Unable to perform a request to: https://confluence.motivatingjenny.org/rest/gadgets/1.0/g/messagebundle/und/gadget.common%2Cgadget.activity.stream%2Cstreams.comment.action%2Cstream.error.unexpected
 -- referer: https://confluence.motivatingjenny.org/pages/viewpage.action?pageId=4456451&focusedCommentId=4456457 | url: /plugins/macrobrowser/browse-macros.action | traceId: 90160b53bc440809 | userName: ttt23 | action: browse-macros

I have hosted a shortened version of the log (going back only a few days):

https://expirebox.com/download/c07765974af4e6dd72e0ce830fbeb4e7.html

[AnnWorley]

I checked out the log and it looks like there is an intermittent name resolution (UnknownHostException) error:

2017-10-13 21:45:30,636 ERROR [http-nio-8090-exec-6] [renderer.internal.http.HttpClientFetcher] fetch Unable to perform a request to: https://confluence.motivatingjenny.org/rest/gadgets/1.0/g/messagebundle/en_GB/gadget.common%2Cgadget.confluence
 -- referer: https://confluence.motivatingjenny.org/pages/viewpage.action?pageId=4456451&focusedCommentId=4456457 | url: /plugins/macrobrowser/browse-macros.action | traceId: 90160b53bc440809 | userName: ttt23 | action: browse-macros
java.net.UnknownHostException: confluence.motivatingjenny.org

I know it's intermittent because I can reach the URL in the error message, as well as your login page, from my desk. This is also consistent with your report that the issue happens seemingly at random every few days.

Please add confluence.motivatingjenny.org to the hosts file on the server so Confluence won't have to depend on the DNS server. Please see the instructions at java.net.UnknownHostException exceptions in Confluence log file due to DNS lookups failing