Public bug reported: Ubuntu release: 22.04 (Jammy) Package: https://packages.ubuntu.com/jammy/snmpd
The net-snmp project switched to a new implementation of the fsys hardware module at their 5.8 version. This was not mentioned in the release notes, because the decision was made earlier through the build system. The new version did not recognize the /etc/mtab entry of "overlay" as a supported filesystem, so monitoring / inside a Docker container fails after Bionic (5.7.3), likely in every Ubuntu since Focal (5.8). The fix happened in this commit, already on their master: https://github.com/net-snmp/net-snmp/commit/798f206561b7de4bc54453c01ffd21de8ae59c87 Since it is an added item in a static list, it would be easy to backport to Jammy's 5.9.1, or most other releases really. A refactor happened at some point that makes backporting before a certain version a bit more interesting, but still easy based on the suggestions in this similar issue: https://github.com/net-snmp/net-snmp/issues/268 Steps to reproduce: 1. Extract the attached zip with a Dockerfile, a patch, and an snmpd.conf 2. Run "docker build -t repro . && docker run --rm -p 161:161/udp repro" to compile and start a Jammy container with a 5.9.1 snmpd inside. 3. Query the disk table from another terminal: "snmpwalk -v2c -c public 0.0.0.0:161 .1.3.6.1.4.1.2021.9" There should be no OID found. Repeat steps 2 and 3 after uncommenting the two lines in the Dockerfile that apply the patch. Now proper data should arrive about the root filesystem. I would like to get an SRU with this patch for Jammy. There should be no risk except for snmpd users. The patch is recent and not released, so it is not widely tested yet. It should only impact snmpd users with Docker containers, since it only expands the list of recognized filesystems with "overlay". This feature was broken since Focal, so I assume there aren't many such users. ** Affects: net-snmp (Ubuntu) Importance: Undecided Status: New ** Attachment added: "Files for reproduction and verification" https://bugs.launchpad.net/bugs/2007856/+attachment/5648641/+files/repro.zip ** Package changed: unattended-upgrades (Ubuntu) => net-snmp (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unattended-upgrades in Ubuntu. https://bugs.launchpad.net/bugs/2007856 Title: snmpd fails to recognize Docker's overlay filesystem Status in net-snmp package in Ubuntu: New Bug description: Ubuntu release: 22.04 (Jammy) Package: https://packages.ubuntu.com/jammy/snmpd The net-snmp project switched to a new implementation of the fsys hardware module at their 5.8 version. This was not mentioned in the release notes, because the decision was made earlier through the build system. The new version did not recognize the /etc/mtab entry of "overlay" as a supported filesystem, so monitoring / inside a Docker container fails after Bionic (5.7.3), likely in every Ubuntu since Focal (5.8). The fix happened in this commit, already on their master: https://github.com/net-snmp/net-snmp/commit/798f206561b7de4bc54453c01ffd21de8ae59c87 Since it is an added item in a static list, it would be easy to backport to Jammy's 5.9.1, or most other releases really. A refactor happened at some point that makes backporting before a certain version a bit more interesting, but still easy based on the suggestions in this similar issue: https://github.com/net-snmp/net-snmp/issues/268 Steps to reproduce: 1. Extract the attached zip with a Dockerfile, a patch, and an snmpd.conf 2. Run "docker build -t repro . && docker run --rm -p 161:161/udp repro" to compile and start a Jammy container with a 5.9.1 snmpd inside. 3. Query the disk table from another terminal: "snmpwalk -v2c -c public 0.0.0.0:161 .1.3.6.1.4.1.2021.9" There should be no OID found. Repeat steps 2 and 3 after uncommenting the two lines in the Dockerfile that apply the patch. Now proper data should arrive about the root filesystem. I would like to get an SRU with this patch for Jammy. There should be no risk except for snmpd users. The patch is recent and not released, so it is not widely tested yet. It should only impact snmpd users with Docker containers, since it only expands the list of recognized filesystems with "overlay". This feature was broken since Focal, so I assume there aren't many such users. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/net-snmp/+bug/2007856/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
