Quick Fix: Update Docker to a more recent version. This can be done using the following command:
sudo apt install docker-ce
The Problem:
I recently upgraded the PHP image from 8.1.19 to 8.2.7 in my WordPress application running on a CentOS Linux on-prem server using Docker. After the upgrade, I am unable to update plugins. When I tried to check the issue by running curl -I google.com inside the container, it throws the error: curl: (6) getaddrinfo() thread failed to start.
I checked the listening ports on the server and found that it is using IPv6 for ports 80 and 443 for docker-proxy, while on other servers and my local, it is using IPv4. I suspect this might be causing the issue. How can I force docker to use IPv4 for ports 80 and 443? It’s worth noting that this issue did not occur with PHP 8.1.19 and lower, only with 8.2.x.
The Solutions:
Solution 1: Update Docker to a newer version
The issue was resolved by updating Docker to a newer version. The previous version being used (18.09.7) was outdated and caused compatibility issues with PHP 8.2.x. By updating Docker to a more recent version (24.0.4), the issue with IPv6 binding was resolved, allowing the WordPress application to successfully update plugins and perform other network-related tasks.
Q&A
What Docker version was causing the IPv6 issue?
—
18.09.7
What Docker version solved the IPv6 issue?
—
24.0.4
Video Explanation:
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