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Mirror Manager Maintenance

This SOP contains most if not all the information needed for SIG/Core to maintain and operate Mirror Manager for Rocky Linux.

Contact Information
Owner SIG/Core (Release Engineering & Infrastructure)
Email Contact infrastructure@rockylinux.org
Email Contact releng@rockylinux.org
Mattermost Contacts @label @neil @tgo
Mattermost Channels ~Infrastructure

Introduction

So you made a bad decision and now have to do things to Mirror Manager. Good luck.

Pieces

Item Runs on... Software
Mirrorlist Server mirrormanager001 https://github.com/adrianreber/mirrorlist-server/
Mirror Manager 2 mirrormanager001 https://github.com/fedora-infra/mirrormanager2

Mirrorlist Server

This runs two (2) instances. Apache/httpd is configured to send /mirrorlist to one and /debuglist to the other.

  • Every fifteen (15) minutes: Mirrorlist cache is regenerated

    • This queries the database for active mirrors and other information and writes a protobuf. The mirrorlist-server reads the protobuf and responds accordingly.

  • Every twenty (20) minutes: Service hosting /mirrorlist is restarted

  • Every twenty-one (21) minutes: Service hosting /debuglist is restarted

Note that the timing for the restart of the mirror list instances are arbitrary.

Mirror Manager 2

This is a uwsgi service fronted by an apache/httpd instance. This is responsible for everything else that is not /mirrorlist or /debuglist. This allows the mirror managers to, well, manage their mirrors.

CDN

Fastly sits in front of mirror manager. VPN is required to access the /admin endpoints.

If the backend of the CDN is down, it will attempt to guess what the user wanted to access and spit out a result on the dl.rockylinux.org website. For example, a request for AppStream-8 and x86_64 will result in a AppStream/x86_64/os directory on dl.rockylinux.org. Note that this isn't perfect, but it helps in potential down time or patching.

Fastly -> www firewall -> mirrormanager server

In reality, the flow is a lot more complex, and a diagram should be created to map it out in a more user-friendly manner (@TODO)

User -> Fastly -> AWS NLB over TLS, passthru -> www firewall cluster (decrypt TLS) -> mirrormanager server (Rocky CA TLS)

Tasks

Below are a list of possible tasks to take with mirror manager, depending on the scenario.

New Release

For the following steps, the following must be completed:

  • Production rsync endpoints should have all brand new content
  • New content root should be locked down to 750 (without this, mirror manager cannot view it)
  • Disable mirrormanager user cronjobs

  1. Update the database with the new content. This is run on a schedule normally (see previous section) but can be done manually.

    a. As the mirror manager user, run the following:

/opt/mirrormanager/scan-primary-mirror-0.4.2/target/debug/scan-primary-mirror --debug --config $HOME/scan-primary-mirror.toml --category 'Rocky Linux'
/opt/mirrormanager/scan-primary-mirror-0.4.2/target/debug/scan-primary-mirror --debug --config $HOME/scan-primary-mirror.toml --category 'Rocky Linux SIGs'

  1. Update the redirects for $reponame-$releasever

    a. Use psql to mirrormanager server: psql -U mirrormanager -W -h mirrormanager_db_host mirrormanager_db b. Confirm that all three columns are filled and that the second and third columns are identical: select rr.from_repo AS "From Repo", rr.to_repo AS "To Repo", r.prefix AS "Target Repo" FROM repository_redirect AS rr LEFT JOIN repository AS r ON rr.to_repo = r.prefix GROUP BY r.prefix, rr.to_repo, rr.from_repo ORDER BY r.prefix ASC; c. Change the majorversion redirects to point to the new point release, for example: update repository_redirect set to_repo = regexp_replace(to_repo, '9\.0', '9.1') where from_repo ~ '(\w+)-9';

  2. Generate the mirrorlist cache and restart the debuglist and verify.

Once the bitflip is initiated, restart mirrorlist and reenable all cronjobs.

Out-of-date Mirrors

  1. Get current shasum of repomd.xml. For example: shasum=$(curl https://dl.rockylinux.org/pub/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml | sha256sum)
  2. Compare against latest propagation log:
tail -latr /var/log/mirrormanager/propagation/rocky-9.0-BaseOS-x86_64_propagation.log.*`

export VER=9.0
awk -v shasum=$(curl -s https://dl.rockylinux.org/pub/rocky/$VER/BaseOS/x86_64/os/repodata/repomd.xml | sha256sum | awk '{print $1}') -F'::' '{split($0,data,":")} {if ($4 != shasum) {print data[5], data[6], $2, $7}}' < $(find /var/log/mirrormanager/propagation/ -name "rocky-${VER}-BaseOS-x86_64_propagation.log*" -mtime -1 | tail -1)'

This will generate a table. You can take the IDs in the first column and use the database to disable them by ID (table name: hosts) or go to https://mirrors.rockylinux.org/mirrormanager/host/ID and uncheck 'User active'.

Users can change user active, but they cannot change admin active. It is better to flip user active in this case.

Admins can also view https://mirrors.rockylinux.org/mirrormanager/admin/all_sites if necessary.

Example of table columns:

[mirrormanager@ord1-prod-mirrormanager001 propagation]$ awk -v shasum=$(curl -s https://dl.rockylinux.org/pub/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml | sha256sum | awk '{print $1}') -F'::' '{split($0,data,":")} {if ($4 != shasum) {print data[5], data[6], $2, $7}}' < rocky-9.0-BaseOS-x86_64_propagation.log.1660611632 | column -t
164  mirror.host.ag            http://mirror.host.ag/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml             404
173  rocky.centos-repo.net     http://rocky.centos-repo.net/9.0/BaseOS/x86_64/os/repodata/repomd.xml            403
92   rocky.mirror.co.ge        http://rocky.mirror.co.ge/9.0/BaseOS/x86_64/os/repodata/repomd.xml               404
289  mirror.vsys.host          http://mirror.vsys.host/rockylinux/9.0/BaseOS/x86_64/os/repodata/repomd.xml      404
269  mirrors.rackbud.com       http://mirrors.rackbud.com/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml        200
295  mirror.ps.kz              http://mirror.ps.kz/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml               200
114  mirror.liteserver.nl      http://rockylinux.mirror.liteserver.nl/9.0/BaseOS/x86_64/os/repodata/repomd.xml  200
275  mirror.upsi.edu.my        http://mirror.upsi.edu.my/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml         200
190  mirror.kku.ac.th          http://mirror.kku.ac.th/rocky-linux/9.0/BaseOS/x86_64/os/repodata/repomd.xml     404
292  mirrors.cat.pdx.edu       http://mirrors.cat.pdx.edu/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml        200
370  mirrors.gbnetwork.com     http://mirrors.gbnetwork.com/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml      404
308  mirror.ihost.md           http://mirror.ihost.md/rockylinux/9.0/BaseOS/x86_64/os/repodata/repomd.xml       404
87   mirror.freedif.org        http://mirror.freedif.org/Rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml         404
194  mirrors.bestthaihost.com  http://mirrors.bestthaihost.com/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml   404
30   mirror.admax.se           http://mirror.admax.se/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml            200
195  mirror.uepg.br            http://mirror.uepg.br/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml             404
247  mirrors.ipserverone.com   http://mirrors.ipserverone.com/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml    404'