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101 lines
2.9 KiB
Bash
101 lines
2.9 KiB
Bash
#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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#
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# Author: Hari Sekhon
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# Date: 2020-08-28 11:06:23 +0100 (Fri, 28 Aug 2020)
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#
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# https://github.com/HariSekhon/bash-tools
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#
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# License: see accompanying Hari Sekhon LICENSE file
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#
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# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
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#
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# https://www.linkedin.com/in/HariSekhon
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#
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set -euo pipefail
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[ -n "${DEBUG:-}" ] && set -x
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srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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# shellcheck disable=SC1090
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. "$srcdir/lib/utils.sh"
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# shellcheck disable=SC2034,SC2154
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usage_description="
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Kubectl exec's to the first pod matching the given regex name and optional pod filters
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Shows the full auto-generated 'kubectl exec' command for clarity
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Execs /bin/sh because we can't be sure /bin/bash exists in a lot of containers
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This is useful to quickly jump in to any pod in a namespace/deployment to debug a web farm etc.
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First arg is the pod's name as an extended regex (ERE)
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Optional second arg is the container's name as an extended regex (ERE)
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Subsequent args from the first dash are passed straight to 'kubectl get pods' to set namespace, label filters etc.
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Examples:
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${0##*/} nginx
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${0##*/} nginx -n prod
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${0##*/} nginx -n prod -l app=nginx
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${0##*/} nginx sidecar-container -n prod -l app=nginx
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See also:
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kubectl_exec.sh
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for a version with one less arg that works strictly on pod filters
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There is similar stuff in the .bash.d/kubernetes.sh interactive library
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"
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# used by usage() in lib/utils.sh
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# shellcheck disable=SC2034
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usage_args="<pod_name_regex> [<container_name_regex>] [<pod_filters>]"
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help_usage "$@"
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min_args 1 "$@"
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pod_regex="$1"
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shift || :
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container_regex="."
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if [ $# -gt 0 ]; then
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if ! [[ "$1" =~ ^- ]]; then
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container_regex="$1"
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shift || :
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fi
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fi
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kubectl cluster-info &>/dev/null || die "Failed to connect to Kubernetes cluster!"
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pod="$(kubectl get pods "$@" -o 'jsonpath={.items[*].metadata.name}' | tr ' ' '\n' | grep -E -m 1 "$pod_regex" || :)"
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if [ -z "$pod" ]; then
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die "No matching pods found, perhaps you forgot to pass the --namespace? (tip: specify -A / --all-namespaces if lazy, it'll filter by pod name)"
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fi
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# auto-determine namespace because specifying it is annoying
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namespace="$(kubectl get pods --all-namespaces | grep -E "^[^[:space:]]+[[:space:]]+[^[:space:]]*${pod}" | awk '{print $1; exit}' || :)"
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if [ -z "$namespace" ]; then
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die "failed to auto-determine namespace for pod '$pod'"
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fi
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# auto-determine container from regex if given or just take first container
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container="$(kubectl get pods -n "$namespace" "$pod" -o 'jsonpath={.spec.containers[*].name}' | grep -m 1 "$container_regex" | awk '{print $1}' || :)"
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if [ -z "$container" ]; then
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die "failed to get container name matching regex '$container_regex' for pod '$pod'"
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fi
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cmd="kubectl exec -ti --namespace \"$namespace\" \"$pod\" --container \"$container\" /bin/sh"
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echo "$cmd"
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eval "$cmd"
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