Some servers in this state may also simply refuse the socket connection, in which case a different error may be generated because the socket creation timed out. Private and Public Cloud users Overloaded server The steps in this section are primarily for Edge Private Cloud users; however, some steps can be performed by Edge Public Cloud users, as indicated. If not why does pound not direct to the other load balancer? For help clarifying this question so that it can be reopened,. If so how does pound determine this situation? I'm not convinced it was a health check issue but since no one, including Amazon, can provide a better answer I'm marking it as the answer. When the queues are full Apache throws a 503. If the problem persists, work with your Network administrator to determine and fix the issue.
Restarting apache temporarily fixes the problem. Connection errors The steps in this section are for Edge Private Cloud users only. It appears that this is from pound. Very strange in any case. If so how does pound determine this situation? Troubleshooting for this class of problem is covered in a separate topic.
If this question can be reworded to fit the rules in the , please. Was this troubleshooting playbook helpful? An incoming northbound error occurs between the client application and Edge. I actually didn't do the math, but just tweaked the values up until I could observe a wide margin to the peak consumption of the queue resources. If you are not the intended recipient, be advised that you have received this email in error and that any use, dissemination, forwarding, printing, or copying of this email is strictly prohibited. Where possible, we provide alternative ways to investigate the problem that do not require direct access to these components. It would follow that the same could happen when Apache is the backend, and the frontend delivers at such a rate as to make the queues fill up.
Procedure 3: Using Nginx Access Logs For Apigee Private Cloud users only If you are a Public Cloud user, skip this procedure. It was rather certain requests which were slower to serve which just happened to come too many on occasion. If so how does pound determine this situation? Any insite on how to prevent these events would be appreciated. The contents of this message will not be in any way binding upon Arts Council England. When that happens, the corresponding output queues of Apache start filling up.
If the response is 200 and you still see 503, you'll need to check the backend server's Nginx access. Simply waiting out the connector flooding was not enough. It seems from the comment it might be possible to direct sessions to different backend servers but I don't see how to do so. The effect is that if Apache delivers more connection requests than can be processed by the backend, the backend input queues fill up until no more connections can be accepted. If not why does pound not direct to the other load balancer? ConnectException: Connection refused error indicates the connection was refused by the backend server.
Were these troubleshooting steps helpful? It appears that this is from pound. This led me first looking in places which had nothing to do with what actually happened, but even after proper diagnose and cure I still haven't been able to understand the necessity of service restart. An outgoing southbound error occurs between Edge and the backend target server. The implication is that this is a temporary condition which will be alleviated after some delay. Please to let us know.
ServiceUnavailable faults exceeds a particular threshold. If so how does pound determine this situation?. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. Opinions, conclusions, contractual obligations and other information in this message, in so far as they relate to the official business of Arts Council England must be specifically confirmed in writing. Hope this was of some help.
It can also occur if the between the client and the server. Please to let us know. These internal components are not visible or accessible to Public Cloud users. Also, when this happened to me I was baffled that I had to restart the Apache service in order to not get served 503:s again. To diagnose these kinds of problems, your first job is to figure out whether the error occurs on the northbound or southbound connection.