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chore: added example and improved comments

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Michele Cereda
2023-03-25 16:27:22 +01:00
parent 21015c0956
commit 9912b6a433
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knowledge base/parallel.md
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@@ -3,26 +3,33 @@
## TL;DR
```sh
# group output (--group)
# fill up cpu threads (--jobs 100%)
# use newline as delimiter for the arguments in input
# simulate and print to output the command that would have been executed
# Group output ('--group', defaults to on).
# Fill up CPU threads ('--jobs 0' or '--jobs 100%').
# Use newline as delimiter for the arguments in input.
# Simulate and print to output the command that would have been executed.
find . -type f \
| parallel --group --jobs 0 --delimiter '\n' --dry-run clamscan {}
# get the exit status of all subjobs (--joblog $outfile)
# use all the threads you can (--jobs 0), hammering the cpu
# Rsync all folders in a directory to a NAS.
# So it one by one, and print and properly quote the command before execution.
parallel -qt -j 1 \
rsync -a --info=stats2 {} nas.lan:/shares/backup/ \
::: backup/.snapshots/*
# Get the exit status of all subjobs ('--joblog $outfile').
# Use all the threads you can (--jobs 0), hammering the CPU.
find . -type d -name .git -exec dirname "{}" + \
| parallel --group --jobs 0 --tagstring {/} --joblog - \
| parallel --jobs 0 --tagstring {/} --joblog - \
'git -C {} pull --recurse-submodules'
# inject istio to all deployments in a namespace in (GNU) parallel
# Inject Istio's sidecar to all deployments in a namespace.
kubectl get deployments -o jsonpath='{.items[*].metadata.name}' \
| parallel --group --jobs 0 'kubectl -n ${NAMESPACE:-default} apply -f \
| parallel --jobs 0 'kubectl -n ${NAMESPACE:-default} apply -f \
<(istioctl kube-inject -f \
<(kubectl get deployments,services {} -o json))'
# given a list of namespaces get pods and their nodes
# Given a list of namespaces, get all Pods in them and the nodes they are
# running on.
parallel --group --jobs 100% --tag \
"kubectl --context $KUBE_CONTEXT --namespace {} get pods --output json \
| jq -r '.items[] | .metadata.name + \"\t\" + .spec.nodeName' -" \