Redis server went away

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:

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

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”
]

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

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.

You can try using Predis instead, it supports TLS.

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

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.