Redis server went away

  • Resolved jordanmc

    (@jordanmc)


    3 years, 7 months ago

    I am not able to connect to my remote Redis host via WordPress dashboard. Diagnostics are at the bottom which shows my config values.

    Do I need to install redis on my WordPress server even though I am connecting to a remote Redis server?

    I am able to connect to my remote Redis host via redis-cli on my WordPress server via SSH.

    Here is the diagnostics:
    Status: Not connected
    Client: PhpRedis (v3.1.2)
    Drop-in: Valid
    Disabled: No
    Filesystem: Working
    Ping:
    Connection Exception: Redis server went away (RedisException)
    Errors: [
    “Redis server went away”
    ]
    PhpRedis: 3.1.2
    Predis: Not loaded
    Credis: Not loaded
    PHP Version: 7.2.13
    Plugin Version: 2.0.13
    Redis Version: Unknown
    Multisite: No
    Global Prefix: “wp_”
    Blog Prefix: “wp_”
    WP_REDIS_CLIENT: “pecl”
    WP_REDIS_SCHEME: “tls”
    WP_REDIS_HOST: “blog.redis.cache.windows.net”
    WP_REDIS_PORT: “6380”
    WP_REDIS_DATABASE: “0”
    WP_REDIS_PREFIX: “ambassador-blog”
    WP_CACHE_KEY_SALT: “ambassador-blog”
    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”
    ]
    Ignored Groups: [
    “counts”,
    “plugins”,
    “themes”,
    “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”
    ]
    Unflushable Groups: []
    Drop-ins: [
    “Redis Object Cache Drop-In v2.0.13 by Till Krüss”
    ]

Viewing 8 replies - 1 through 8 (of 8 total)
  • Thread Starter jordanmc

    (@jordanmc)

    3 years, 7 months ago

    PHP errors below. Says name cannot resolve which is interesting to me since I can connect via this command:

    redis-cli -h blog.redis.cache.windows.net -p 6380 -a password

    #8 {main}
    [07-Sep-2020 17:37:20 UTC] PHP Warning: Redis::connect(): php_network_getaddresses: getaddrinfo failed: Name does not resolve in /home/site/wwwroot/wp-content/object-cache.php on line 574
    [07-Sep-2020 17:37:20 UTC] PHP Warning: Redis::connect(): connect() failed: php_network_getaddresses: getaddrinfo failed: Name does not resolve in /home/site/wwwroot/wp-content/object-cache.php on line 574
    [07-Sep-2020 17:37:20 UTC] RedisException: Redis server went away in /home/site/wwwroot/wp-content/object-cache.php:578
    Stack trace:

    Plugin Author Till Krüss

    (@tillkruess)

    3 years, 7 months ago

    That usually means your PHP-FPM process can’t connect to the server, but your computer can. Firewall?

    Thread Starter jordanmc

    (@jordanmc)

    3 years, 7 months ago

    I haven’t tried to connect to Redis from my computer.

    I was connecting to my redis server from the WordPress server via redis-cli.

    My diagnostics output isn’t showing anything more but here is the full output again.
    I tried updating PhpRedis but it does not appear to be showing any updated version. Not sure if that would help anyway.

    There is a firewall but it isn’t blocking anything right now and I can connect via SSH from the WP Server.

    Status: Not connected
    Client: PhpRedis (v3.1.2)
    Drop-in: Valid
    Disabled: No
    Filesystem: Working
    Ping:
    Connection Exception: Redis server went away (RedisException)
    Errors: [
    “Redis server went away”
    ]
    PhpRedis: 3.1.2
    Predis: Not loaded
    Credis: Not loaded
    PHP Version: 7.2.13
    Plugin Version: 2.0.13
    Redis Version: Unknown
    Multisite: No
    Global Prefix: “wp_”
    Blog Prefix: “wp_”
    WP_REDIS_CLIENT: “pecl”
    WP_REDIS_SCHEME: “tls”
    WP_REDIS_HOST: “blog.redis.cache.windows.net”
    WP_REDIS_PORT: “6380”
    WP_REDIS_DATABASE: “0”
    WP_REDIS_PREFIX: “wordpressheadless.azurewebsites.net”
    WP_CACHE_KEY_SALT: “wordpressheadless.azurewebsites.net”
    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”
    ]
    Ignored Groups: [
    “counts”,
    “plugins”,
    “themes”,
    “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”
    ]
    Unflushable Groups: []
    Drop-ins: [
    “Redis Object Cache Drop-In v2.0.13 by Till Krüss”
    ]

    Plugin Author Till Krüss

    (@tillkruess)

    3 years, 7 months ago

    Oh. You’re trying to connect via TLS which was added in PhpRedis 5.1 I believe. You need to update PhpRedis 👍🏻

    Thread Starter jordanmc

    (@jordanmc)

    3 years, 7 months ago

    For now, I am just got to use the local server. I tried to update PhpRedis but it didn’t work and I am not familiar with Linux itself as I had used a Docker container that contained WP, etc.

    Plugin Author Till Krüss

    (@tillkruess)

    3 years, 7 months ago

    You can try using Predis instead, it supports TLS.

    Thread Starter jordanmc

    (@jordanmc)

    3 years, 7 months ago

    Wouldn’t using the local WP server actually be faster? Or is it better to use a remote server? I have a Redis server in Azure I can use.

    Thanks

    Plugin Author Till Krüss

    (@tillkruess)

    3 years, 7 months ago

    Yes, local instances can be faster if your machine has enough memory, but your web server and Redis are sharing the CPU which will be the bottleneck with enough traffic.

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