Error: memcached flush_all not working
Solution for the "Memcached Flush_all Not Working" Error
The "memcached flush_all not working" error typically occurs when the flush_all
command fails to clear the cache in a Memcached instance. This can be due to various reasons such as incorrect configuration, permission issues, or version incompatibilities.
Common Causes and Solutions
1. Incorrect Configuration:
- Ensure that the Memcached server is running and properly configured.
- Check the Memcached configuration file (usually
memcached.conf
) for any syntax errors or incorrect settings. - Verify that the
flush_all
command is not disabled in the configuration file.
2. Permission Issues:
- Ensure that the user running the
flush_all
command has the necessary permissions to access and modify the Memcached instance. - Check the permissions on the Memcached socket file (usually
/tmp/memcached.sock
) and ensure that the user has write access.
3. Version Incompatibilities:
- Verify that the Memcached client library and the Memcached server are compatible versions.
- Ensure that the client library supports the
flush_all
command.
Troubleshooting Steps
1. Check Memcached Status:
- Run the command
memcached -vv
to check the Memcached status and verify that it is running correctly.
2. Verify Flush_all Command:
- Run the command
telnet localhost 11211
to connect to the Memcached server. - Issue the command
flush_all
and check the response. If it fails, check the Memcached logs for errors.
3. Check Memcached Logs:
- Check the Memcached logs for any error messages related to the
flush_all
command. - Verify that the logs are correctly configured and that log rotation is not causing issues.
4. Test with Memcached Client:
- Use a Memcached client library (e.g.,
pymemcache
in Python) to test theflush_all
command. - Verify that the client library is correctly configured and that the
flush_all
command is supported.
Additional Tips
Use the -v
Option:
- When running the
memcached
command, use the-v
option to increase verbosity and get more detailed output.
Check Firewall Settings:
- Ensure that the firewall settings are not blocking the Memcached port (usually 11211).
Restart Memcached:
- If all else fails, try restarting the Memcached server to see if it resolves the issue.
By following these steps and troubleshooting tips, you should be able to identify and resolve the "memcached flush_all not working" error.
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