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76 lines
2.6 KiB
Bash
76 lines
2.6 KiB
Bash
#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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# args: echo context is now {context}
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#
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# Author: Hari Sekhon
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# Date: 2020-08-26 16:18:30 +0100 (Wed, 26 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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. "$srcdir/lib/utils.sh"
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# shellcheck disable=SC2034,SC2154
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usage_description="
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Run a command against each configured Kubernetes kubectl context (cluster)
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Can chain with kubernetes_foreach_namespace.sh
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This is powerful so use carefully!
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See Also: gke_kube_creds.sh to auto-create all your contexts for all clusters on Google Kubernetes Engine!
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Requires 'kubectl' to be configured and available in \$PATH
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All arguments become the command template
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Sets the kubectl context in each iteration and then returns the context to the original context on any exit except kill -9
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Replaces {context} if present in the command template with the current kubectl context name in each iteration, but often this isn't necessary to specify explicitly given the kubectl context is changed in each iteration for each context for convenience running short commands local to the context
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eg.
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${0##*/} kubectl get pods
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Since lab contexts like Docker Desktop, Minikube etc are often offline and likely to hang, they are skipped. Deleted GKE clusters you'll need to remove from your kubeconfig yourself before calling this
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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="<command> <args>"
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help_usage "$@"
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min_args 1 "$@"
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cmd_template="$*"
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original_context="$(kubectl config current-context)"
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while read -r context; do
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if [[ "$context" =~ docker|minikube|minishift ]]; then
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echo "Skipping context '$context'..."
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echo
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continue
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fi
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echo "# ============================================================================ #" >&2
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echo "# Kubernetest context = $context" >&2
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echo "# ============================================================================ #" >&2
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# shellcheck disable=SC2064 # want interpolation now
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trap "echo; echo 'Reverting to original context:' ; kubectl config use-context '$original_context'" EXIT
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kubectl config use-context "$context"
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cmd="${cmd_template//\{context\}/$context}"
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eval "$cmd"
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echo
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done < <(kubectl config get-contexts -o name)
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