MirrorManager Infrastructure SOP
MirrorManager manages mirrors for fedora distribution.
Fedora Infrastructure Team
#fedora-admin, sysadmin-main, sysadmin-web
mm-frontend01, mm-frontend02, mm-frontend-checkin01, mm-backend01, mm-crawler01, mm-crawler02
- Mirrorlist Servers
Docker container on the proxy servers
Manage mirrors for Fedora distribution
MirrorManager handles our mirroring system. It keeps track of lists of valid mirrors and handles handing out metalink URLs to end users to download packages from.
The backend server (mm-backend01) scans the master mirror (NFS mounted
/srv) using the mm2_update-master-directory-list script (umdl)
for changes. Changed directories are detected by comparing the ctime to
the value in the database.
The two crawlers (mm-crawler01 and mm-crawler02) compare the content on the mirrors with the results from umdl using RSYNC, HTTP, HTTPS. The crawler process on mm-crawler01 starts at 0:00 and 12:00 and at 2:00 and 14:00 on mm-crawler02.
If the content on the mirrors is the same as on the master those mirrors are included in the dynamic metalink/mirrorlist.
Every hour the backend server generates a python pickle which contains the information about the state of each mirror. This pickle file is used by the mirrorlist containers on the proxy servers to dynamically generate the metalink/mirrorlist for each client individually.
The frontend servers (mm-frontend01 and mm-frontend02) offer an interface to manipulate the mirrors. Each mirror-admin can only change the details of the associated mirror. Members of the FAS group sysadmin-web can seen and change all existing mirrors.
The mirrorlist provided by the frontend servers has no actively consumed content and is therefore heavily cached (12h). It is only used to give an overview of existing mirrors.
- Additionally the frontend servers provide
an overview of the mirror list usage https://admin.fedoraproject.org/mirrormanager/statistics
a propagation overview https://admin.fedoraproject.org/mirrormanager/propgation
a mirror map https://admin.fedoraproject.org/mirrormanager/maps
The mm-frontend-checkin01 server is only used for report_mirror check-ins. This is used by mirrors to report their status independent of the crawlers.
MirrorManager should automatically detect the new release version, and
will create a new
Version() object in the database. This is visible on
the Version page in the web UI, and on
If the versioning scheme changes, it’s possible this will fail. If so, contact the Mirror Wrangler.
One Week After a Release
In the first week after the release MirrorManager still uses the files
fedora/linux/development/<version> and not at
Once enough mirrors have picked up the files in the release directory following script (on mm-backend01) can be used to change the paths in MirrorManager:
sudo -u mirrormanager mm2_move-devel-to-release --version=26 --category="Fedora Linux" sudo -u mirrormanager mm2_move-devel-to-release --version=26 --category="Fedora Secondary Arches"
Move to Archive
Once the files of an EOL release have been copied to the archive directory tree and enough mirrors have picked the files up at the archive location there is also a script to adapt those paths in MirrorManager’s database:
sudo -u mirrormanager mm2_move-to-archive --originalCategory='Fedora EPEL' --directoryRe='/4/'
mirrorlist containers and mirrorlist servers
Every hour at :55 after the hour, mm-backend01 generates a pkl file with all the current mirrormanager information in it and syncs it to proxies and mirrorlist-servers. Each proxy accepts requests to mirrors.fedoraproject.org on apache, then uses haproxy to determine what backend will reply. There are 2 containers defined on each proxy: mirrorlist1 and mirrorlist2. haproxy will look for those first, then fall back to any of the mirrorlist servers defined over the vpn.
At :15 after the hour, a script runs on all proxies:
/usr/local/bin/restart-mirrorlist-containers This script starts up
mirrorlist2 container, makes sure it can process requests and then if
so, restarts mirrorlist1 container with the new pkl data. If not,
mirrorlist1 keeps running with the old data. During this process at
least one (with mirrorlists servers as backup) server is processing
requests so users see no issues.
mirrorlist-containers log to
the host proxy server.
Troubleshooting and Resolution
Regenerating the Publiclist
sudo -u mirrormanager /usr/bin/mm2_update-mirrorlist-server sudo -u mirrormanager /usr/local/bin/sync_pkl_to_mirrorlists.sh
Those two commands generates a new mirrorlist pickle and transfers it to the proxies. The mirrorlist containers on the proxies are restarted 15 minutes after each full hour.
The mirrorlist generation can take up to 20 minutes. If a faster solution is required the mirrorlist pickle from the previous run is available at:
Updating the mirrorlist containers
The container used for mirrorlists is the mirrormanager2-mirrorlist container in Fedora dist git: https://src.fedoraproject.org/cgit/container/mirrormanager2-mirrorlist.git/ The one being used is defined in a ansible variable in: roles/mirrormanager/mirrorlist_proxy/defaults/main.yml (TODO: This file no longer exists, find the new place where this is defined) and in turn used in systemd unit files for mirrorlist1 and mirrorlist2. To update the container used, update this variable, run the playbook and then restart the mirrorlist1 and mirrorlist2 containers on each proxy. Note that this may take a while the first time as the image has to be downloaded from our registry.
Debugging problems with mirrorlist container startup
Sometimes on boot some hosts won’t be properly serving mirrorlists. This
is due to a container startup issue. run:
docker ps -a as root to see
the active containers. It will usually say something like 'exited(1)' or
the like. Record the container id and then run:
docker rm --force
<containerid> then run
docker ps -a and confirm nothing shows. Then
systemctl start mirrorlist1 and it should correctly start
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