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| 1 | + | # docker | |
| 2 | + | ||
| 3 | + | ### Build arm64 image on amd64 host | |
| 4 | + | ||
| 5 | + | ```javascript | |
| 6 | + | docker buildx build --platform linux/arm64 -t glitchcrab/ubuntu-debug:latest --output=type=registry . | |
| 7 | + | ``` | |
| 8 | + | ||
| 9 | + | ||
| 10 | + | --- | |
| 11 | + | ||
| 12 | + | ### Run commands in container’s network namespace | |
| 13 | + | ||
| 14 | + | * get the container's ID from `docker ps`, then use it to get the PID: | |
| 15 | + | ||
| 16 | + | `pid=$(docker inspect -f '{{.State.Pid}}' ${container_id})` | |
| 17 | + | ||
| 18 | + | * ensure the netns dir exists and then create the required symlink: | |
| 19 | + | ||
| 20 | + | ``` | |
| 21 | + | mkdir -p /var/run/netns/ | |
| 22 | + | ln -sfT /proc/<pid>/ns/net /var/run/netns/<container id> | |
| 23 | + | ``` | |
| 24 | + | ||
| 25 | + | * run a command inside the netns: | |
| 26 | + | ||
| 27 | + | `ip netns exec <container id> ip a` | |
| 28 | + | ||
| 29 | + | ||
| 30 | + | --- | |
| 31 | + | ||
| 32 | + | ### Find largest container log files | |
| 33 | + | ||
| 34 | + | ```javascript | |
| 35 | + | find /var/lib/docker/containers \ | |
| 36 | + | -name '*-json.log' \ | |
| 37 | + | -printf '%s %p\n' \ | |
| 38 | + | | sort -nr \ | |
| 39 | + | | numfmt --to=iec | |
| 40 | + | ``` | |
| 41 | + | ||
| 42 | + | ||
| 43 | + | *** | |
| 44 | + | ||
| 45 | + | ### Check disk usage | |
| 46 | + | ||
| 47 | + | ```javascript | |
| 48 | + | docker system df | |
| 49 | + | ``` | |
| 50 | + | ||
| 51 | + | ||
| 52 | + | *** | |
simon revised this gist 1 month ago · 13946e8
1 file changed, 52 insertions