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Symlink $EPREFIX/etc/hosts to host #88

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bedroge opened this issue Mar 4, 2021 · 1 comment · Fixed by #89
Closed

Symlink $EPREFIX/etc/hosts to host #88

bedroge opened this issue Mar 4, 2021 · 1 comment · Fixed by #89
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@bedroge
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bedroge commented Mar 4, 2021

I noticed that we don't do this at the moment, which means that tools will now pick up the hosts file from the Prefix. I just did some tests, and this could lead to strange issues, e.g.:

$ /cvmfs/pilot.eessi-hpc.org/2021.02/compat/linux/x86_64/startprefix 
Entering Gentoo Prefix /cvmfs/pilot.eessi-hpc.org/2021.02/compat/linux/x86_64

$ hostname
dh-node12

$ which curl
/cvmfs/pilot.eessi-hpc.org/2021.02/compat/linux/x86_64/usr/bin/curl

$ curl http://dh-node12:9100            
curl: (6) Couldn't resolve host 'dh-node12'

$ /usr/bin/curl http://dh-node12:9100
<html>
			<head><title>Node Exporter</title></head>
			<body>
			<h1>Node Exporter</h1>
			<p><a href="/metrics">Metrics</a></p>
			</body>
			</html>

$ strace curl http://dh-node12:9100 2>&1 | grep hosts
openat(AT_FDCWD, "/cvmfs/pilot.eessi-hpc.org/2021.02/compat/linux/x86_64/etc/hosts", O_RDONLY|O_CLOEXEC) = 5

So I think we should change this by uncommenting:
https://github.com/EESSI/compatibility-layer/blob/main/ansible/playbooks/roles/compatibility_layer/defaults/main.yml#L72
@bedroge bedroge added the bug Something isn't working label Mar 4, 2021
@bedroge
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bedroge commented Mar 4, 2021

Note that the list of (possible) symlinks in that file are based on suggestions by ComputeCanada, so they also have this hosts symlink. See:
#15 (comment)

@bedroge bedroge mentioned this issue Mar 4, 2021
Merged
@boegel boegel closed this as completed in #89 Mar 4, 2021
poksumdo pushed a commit to poksumdo/compatibility-layer that referenced this issue Jun 8, 2023
@boegel
Merge pull request EESSI#88 from bedroge/direnv
4516ad1 
Ebuild for direnv and add it to the EESSI set
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Make symlink to host's hosts file bedroge/compatibility-layer
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