Support » Plugin: Redis Object Cache » Redis Object cache could not be flushed

Redis Object cache could not be flushed

  • Resolved Shillongtitude

    (@shillongtitude)


    3 weeks, 6 days ago

    I just installed the Redis Object Cache in a new WordPress site and it seems to be connected and working but whenever I try to flush cache, I get the following error:

    Object cache could not be flushed

    And my nginx error log shows the following:

    [error] 22151#22151: *59 connect() failed (111: Connection refused) while connecting to upstream, client: [IP Address], server: example.com, request: "GET /wp-admin/options-general.php?page=redis-cache&action=flush-cache&_wpnonce=fc5d93dca9 HTTP/1.1", upstream: "fastcgi://127.0.0.1:8001", host: "example.com", referrer: "https://example.com/wp-admin/options-general.php?page=redis-cache"

    Diagnostics shows:

    Status: Connected
Client: PhpRedis (v5.3.4)
Drop-in: Valid
Disabled: No
Ping: 1
Errors: []
PhpRedis: 5.3.4
Predis: Not loaded
Credis: Not loaded
PHP Version: 8.0.3
Plugin Version: 2.0.18
Redis Version: 5.0.7
Multisite: No
Filesystem: Working
Global Prefix: "wp_"
Blog Prefix: "wp_"
WP_REDIS_HOST: "127.0.0.1"
WP_REDIS_PORT: 6379
WP_REDIS_PASSWORD: ••••••••
Global Groups: [
    "blog-details",
    "blog-id-cache",
    "blog-lookup",
    "global-posts",
    "networks",
    "rss",
    "sites",
    "site-details",
    "site-lookup",
    "site-options",
    "site-transient",
    "users",
    "useremail",
    "userlogins",
    "usermeta",
    "user_meta",
    "userslugs",
    "redis-cache",
    "blog_meta"
]
Ignored Groups: [
    "counts",
    "plugins",
    "themes"
]
Unflushable Groups: []
Drop-ins: [
    "Redis Object Cache Drop-In v2.0.18 by Till Krüss"
]
Viewing 8 replies - 1 through 8 (of 8 total)
  • Thread Starter Shillongtitude

    (@shillongtitude)

    3 weeks, 6 days ago

    UPDATE:

    I uninstalled the plugin and reinstalled it again but now whenever I click “ENABLE OBJECT CACHE”, the wordpress dashboard randomly logs out and when I try to login again, the wordpress password doesn’t work. When I delete the object-cache.php file from wp-content, I can login to wordpress again.

    tldr: WordPress keeps logging me out if the “object-cache.php” file exists in wp-content.

    Thread Starter Shillongtitude

    (@shillongtitude)

    3 weeks, 6 days ago

    Not sure if this could be the reason but according to a security-hardening guide online, I have renamed the following redis commands using rename-command before installing the plugin or even WordPress:

    FLUSHDB, FLUSHALL, KEYS, PEXPIRE, DEL, CONFIG, SHUTDOWN, BGREWRITEAOF, BGSAVE, SAVE, SPOP, SREM, RENAME, and DEBUG

    If the redis object cache plugin requires any of the above to not be renamed, can you kindly point them out so I can revert them back.

    Plugin Author Till Krüss

    (@tillkruess)

    3 weeks, 6 days ago

    You can’t rename Redis commands. That will break this plugin.

    Make sure you flush the cache after re-enabling it. That will fix your login issues.

    Thread Starter Shillongtitude

    (@shillongtitude)

    3 weeks, 6 days ago

    @tillkruess Should I revert all of the following commands or are there specific commands from the following that I should revert?

    FLUSHDB -- FLUSHALL -- KEYS -- PEXPIRE -- DEL -- CONFIG -- SHUTDOWN -- BGREWRITEAOF -- BGSAVE -- SAVE -- SPOP -- SREM -- RENAME -- DEBUG

    Plugin Author Till Krüss

    (@tillkruess)

    3 weeks, 6 days ago

    I’d suggest using default commands.

    Thread Starter Shillongtitude

    (@shillongtitude)

    3 weeks, 6 days ago

    @tillkruess Changed the commands to their default and everything is working as it should now. Thank you man.

    Thread Starter Shillongtitude

    (@shillongtitude)

    3 weeks, 6 days ago

    Just a side-note question, if I want to use custom command names, is there any way I could manually configure the plugin to run redis commands with the custom renamed commands?

    Plugin Author Till Krüss

    (@tillkruess)

    3 weeks, 6 days ago

    You could submit a PR on GitHub with that feature 👍

    You’d likely need to use rawCommand for everything because Predis/PhpRedis won’t support your custom methods.

Viewing 8 replies - 1 through 8 (of 8 total)
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