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Command to Container Cron Job


This can be set on a cron job, or just on a one-off thing even.

All it does is sends a command to the container

set -e

# Variables: Please fill these out before running the script.

# app_name: The name of the application you are targeting.
# Example: "nextcloud"

# container: The specific container within the pod you are targeting.
# Leave this blank if you want to target the pod itself.
# Example: "web-server"

# command: The command you want to run inside the container or pod.
# NOTE: If the command includes special characters, you will need to escape them.
# Example: "ls -la" or "echo \"Hello, World!\""
command="php occ files:scan --all"

# ignore: A pipe-separated list of pod or container names to ignore.
# These names will be excluded from the selection of target pods.
# Example: "mariadb|redis|postgres"

# Functions (No changes needed below this line)
get_namespace() {
    k3s kubectl get namespaces | awk '{print $1}' | grep -i ^ix-"$1" || echo "Are you sure, you used the right app name?" >&2

get_pod() {
    k3s kubectl get -n "$1" pods --field-selector=status.phase=Running --no-headers | awk '{print $1}' | grep -oE ^"$2-[[:alnum:]]{9,10}-[[:alnum:]]{5}" | grep -iEv "$3" | head -n 1

check_container() {
    [ -n "$1" ] && k3s kubectl get -n "$2" pod "$3" -o=jsonpath="{.spec.containers[*].name}" | grep -w "$1" || echo ""

# Main script
namespace=$(get_namespace "$app_name")

if [ -z "$namespace" ]; then
    echo "Namespace for the app not found. Exiting." >&2
    exit 1

pod=$(get_pod "$namespace" "$app_name" "$ignore")

if [ -z "$pod" ]; then
    echo "Pod for the app not found. Exiting." >&2
    exit 1

container_exists=$(check_container "$container" "$namespace" "$pod")

if [ -n "$container_exists" ]; then
    k3s kubectl exec -n "$namespace" "$pod" --container "$container" -- $command
    k3s kubectl exec -n "$namespace" "$pod" -- $command

This specific example will send the command php occ files:scan --all to Nextcloud's hpb container (which will then re-scan all of the files, adding them to the WEB-GUI if they are not already there)

Nextcloud REQUIRES that you specify the hpb container to run this command however

  • Usually you don't need to specify the container, so you can delete container='hpb and --container "$container" if you do not need them..

    • If you don't know if you need them.. you likely don't need them