How to set containerd proxy after installation?

[Magicloud]

I am using NixOS, hence I did not install K3S via the script, but Nixpkgs. And due to I am using ZFS, I used external Containerd, instead of the one from K3S.

Look through the doc, CONTAINER_HTTPS_PROXY is set in an environment file. So I made the service file as:

# /etc/systemd/system/k3s.service
[Unit]
After=firewall.service network-online.target
Description=k3s service
Wants=firewall.service network-online.target

[Service]
Environment="LOCALE_ARCHIVE=/nix/store/m4n7lnvkrdnymlpa8pwy1pwnr93s1vgh-glibc-locales-2.40-36/lib/locale/locale-archi>
Environment="PATH=/nix/store/qhkb7c916jj34rfgics7rss2424hg4gb-zfs-user-2.2.6/bin:/nix/store/sf6y4arqcm100rnnl3dhpg732>
Environment="TZDIR=/nix/store/5z7yfmp96ijpx0lhy5gpj65i38972330-tzdata-2024b/share/zoneinfo"
Delegate=yes
EnvironmentFile=/etc/k3s.service.env
ExecStart=/nix/store/gfy7ivfgns7c5cijq8dycfsa0y6a2w40-k3s-1.31.1+k3s1/bin/k3s server \
 --container-runtime-endpoint unix:///run/containerd/containerd.sock --write-kubeconfig-mode 644
ExecStartPre=/nix/store/28b6fzix8dqpqss4i6wipnjydp27yd4a-activate-k3s-content
KillMode=process
LimitCORE=infinity
LimitNOFILE=1048576
LimitNPROC=infinity
Restart=always
RestartSec=5s
TasksMax=infinity
Type=notify

[Install]
WantedBy=multi-user.target

And in /etc/k3s.service.env

CONTAINERD_HTTPS_PROXY=http://192.168.0.102:8080/

It did not seem working. I also tried directly put the env var in Service.Environment of systemd. No luck.

Where should I set the proxy? Or with external Containerd, I should set the proxy there, not K3S?

[dereknola]

Your last hunch was correct. If you are running external Containerd, you configure it following their standard docs. All the K3s docs are about configuring the embedded containerd that we ship with.

[Magicloud]

Thank you.