redis won't start up after distribution upgrade from Ubuntu 16.04 to 18.04

[Dave Nelson]

I had redis working fine under Ubuntu 16.04 (server edition)  but then I did a distribution upgrade to Ubuntu 18.04 and now redis won't start any more. I tried uninstalling and reinstalling but to no avail. Now it's attempting to start every minute but failing...

A pastebin with the entries being generated once a minute in the redis error log is here: http://pasted.co/01a5bf07

A pastebin showing my redis.conf (in /etc/redis) is here: http://pasted.co/41cb0607

It's the same conf file as was functioning OK under 16.04. Maybe I need to tweak something?

I have 4 of my sites using redis...

A pastebin showing command line output from systemd is here:  http://pasted.co/ffc1c65a

The error log notably says "NOTIFY_SOCKET not found" and "Creating Server TCP listening socket ::1:6379: bind: Cannot assign requested address"

Has anyone else encountered this problem after an Ubuntu distribution upgrade?

Anyone know of a solution?

Thanks for any help, and all the best, 

Dave

[f...@bendingspoons.com]

The error says that it cannot bind an IPV6 address. Check if it's enabled on your machines or modify the configuration to listen only on IPV4 adresses.

[Dave Nelson]

Hi Federico,

Thanks for your reply. I tried disabling ipv6 using this how-to: https://www.techrepublic.com/article/how-to-disable-ipv6-on-linux/

But the result is the same, redis still doesn't start, and can't be reached on 127.0.0.1::1

Meanwhile, trawling the Web, I found a workaround solution: bind it to 0.0.0.0

Redis now starts, but I'm not sure if there are any security implications with this solution...

Any ideas?

All best wishes,

Dave

[Chris Holman]

Your configuration file has:

bind 127.0.0.1 ::1

You can change that line to be just 127.0.0.1 and it should work.

and can't be reached on 127.0.0.1::1

::1 is the IPv6 loopback address, not a port number. The correct address is 127.0.0.1:6379.

There are significant security implications to using 0.0.0.0 - your Redis is now exposed to your network. You should only do that if you understand the risks of open unrestricted access and have mitigated them appropriately. Read more about them here: https://redis.io/topics/security

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[Dave Nelson]

Hello Chris,
Thanks for your message. I have done what you advised and it is now
started on 127.0.0.1:6379.
Thanks very much for your help. ;-)
All best wishes,
Dave