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Bug 1902979

Summary: podman run fails to update /etc/hosts when --uidmap is provided
Product: Red Hat Enterprise Linux 8 Reporter: Suhaas Bhat <subhat>
Component: podmanAssignee: Jindrich Novy <jnovy>
Status: CLOSED ERRATA QA Contact: Alex Jia <ajia>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 8.3CC: bbaude, dornelas, dwalsh, jligon, jnovy, lsm5, mheon, pthomas, tsweeney, umohnani, ypu
Target Milestone: rcFlags: pm-rhel: mirror+
Target Release: 8.4   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: podman-2.2.0-1.el8 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2021-05-18 15:32:56 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1186913, 1823899    

Description Suhaas Bhat 2020-12-01 03:04:29 UTC 
Description of problem:
We do not see a hostname entry inside /etc/hosts file whenever --uidmap is provided against a podman run.

Version-Release number of selected component (if applicable):
 podman-2.0.5-5.module+el8.3.0+8221+97165c3f.x86_64

How reproducible:
Fully

Actual results: podman does not update /etc/hosts when using --uidmap


Expected results:podman should make a default entry when using --uidmap


Additional info:
Comment 1 Matthew Heon 2020-12-01 14:20:11 UTC 
Fixed upstream by https://github.com/containers/podman/commit/3ae47f7d2b9328ff47dc5702d834ae9ee296a27b. A version with the fix should land in RHEL 8.4.
Comment 6 Alex Jia 2021-01-19 08:21:27 UTC 
I got 'permission denied' on fixed version podman-2.2.0-1, please
gave correct fixed version.

# podman run --uidmap 0:100000:1000 --rm --hostname foohostname quay.io/libpod/alpine grep foohostname /etc/hosts
Trying to pull quay.io/libpod/alpine:latest...
Getting image source signatures
Copying blob 9d16cba9fb96 done
Copying config 9617696764 done
Writing manifest to image destination
Storing signatures
Error: container_linux.go:370: starting container process caused: process_linux.go:459: container init caused: rootfs_linux.go:59: mounting "sysfs" to rootfs at "/sys" caused: operation not permitted: OCI permission denied

# rpm -q podman runc crun kernel
podman-2.2.0-1.module+el8.4.0+8963+6755fc2b.x86_64
runc-1.0.0-68.rc92.module+el8.4.0+8963+6755fc2b.x86_64
crun-0.16-1.module+el8.4.0+8963+6755fc2b.x86_64
kernel-4.18.0-259.el8.x86_64

And verified on podman-3.0.0-0.21.module+el8.4.0+9425+98db097b.x86_64.

# podman run --uidmap 0:100000:1000 --rm --hostname foohostname quay.io/libpod/alpine grep foohostname /etc/hosts
Trying to pull quay.io/libpod/alpine:latest...
Getting image source signatures
Copying blob 9d16cba9fb96 done
Copying config 9617696764 done
Writing manifest to image destination
Storing signatures
10.88.0.2    foohostname practical_pare


# rpm -q podman runc crun kernel
podman-3.0.0-0.21.module+el8.4.0+9425+98db097b.x86_64
runc-1.0.0-69.rc92.module+el8.4.0+9425+98db097b.x86_64
crun-0.16-2.module+el8.4.0+9425+98db097b.x86_64
kernel-4.18.0-272.el8.dt5.x86_64
Comment 7 Tom Sweeney 2021-01-19 21:22:50 UTC 
Alex/Jindrich,

As this BZ is targeted for RHEL 8.4, I think Alex should be testing with Podman 3.0.  Jindrich to you concur?
Comment 8 Jindrich Novy 2021-01-20 09:55:12 UTC 
Tom, yes you are right.

Alex, please re-test with podman-3.0.0 which is aimed at 8.4.0, thanks!
Comment 9 Alex Jia 2021-02-01 13:29:54 UTC 
(In reply to Jindrich Novy from comment #8)
> Tom, yes you are right.
> 
> Alex, please re-test with podman-3.0.0 which is aimed at 8.4.0, thanks!

I also gave a test on podman-3.0.0, it works for me, for details, please see Comment 6.
Comment 11 errata-xmlrpc 2021-05-18 15:32:56 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: container-tools:rhel8 security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:1796