Amazon Linux 2 in a Docker missing hostname command
We're developing an app running in a Docker container: on-premises, so this question is purely about Amazon Linux 2 and has nothing to do with AWS.
I'm migrating the image from the one based on centos:7 to amazoncorretto:17, based on amazonlinux:2. Surprisingly, hostname -f, which is used to get an FQDN inside a container, is failing because Amazon Linux 2 doesn't have hostname.
We do need the host FQDN, and it gets propagated to containers either via host networking or via Docker's Swarm --hostname {{.Node.Hostname}}, etc.
I have two questions:
- How do I get an FQDN without
hostname? - Why did Amazon Linux 2 remove it? Even Alpine has it. Would it make sense to put it back?
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Hi,
You can get the hostname command using yum
yum install hostname
Another alternative would be to build your own customized image from amazoncorretto:17 with hostname preinstalled so as to avoid the need for any install during runtime.
--Syd
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Yes, this seems to be the easiest fix.