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Make kubectl get chunk size configurable #45

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Make kubectl get chunk size configurable #45

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10 changes: 8 additions & 2 deletions dump-objects
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,9 @@ readonly EX_PROTOCOL=76
readonly min_expected_kinds=98

default_output_dir=/data/k8s-backup
# Use kubectl --chunk-size=100 by default to reduce kubectl memory usage when
# dumping large resource kinds.
default_chunk_size=100

if ! kubectl=$(type -p kubectl); then
echo "K8s client \"kubectl\" not found in PATH" >&2
Expand All @@ -33,14 +36,16 @@ usage() {
echo " -d Destination directory (default: ${default_output_dir})"
echo ' -s Short delays in case of failures'
echo ' -D enable Debug log'
echo " -c kubectl chunk size (default: ${default_chunk_size})"
}

output_dir="$default_output_dir"
opt_verbose=
opt_debug=false
opt_fastretries=
opt_chunk_size="$default_chunk_size"

while getopts 'hvd:Ds' opt; do
while getopts 'hvd:Dsc:' opt; do
case "$opt" in
h)
usage
Expand All @@ -50,6 +55,7 @@ while getopts 'hvd:Ds' opt; do
d) output_dir="$OPTARG" ;;
s) opt_fastretries=yes ;;
D) opt_debug=true ;;
c) opt_chunk_size="$OPTARG" ;;
*)
usage >&2
exit 1
Expand Down Expand Up @@ -241,7 +247,7 @@ fetch_objects() {
local error=

# Capture stderr
if error=$(run_kubectl get --all-namespaces --output=json "$kind" 2>&1 >"$destfile" | tee -a /dev/stderr); then
if error=$(run_kubectl get --all-namespaces --chunk-size="$opt_chunk_size" --output=json "$kind" 2>&1 >"$destfile" | tee -a /dev/stderr); then
if objcount=$(jq --raw-output '.items | length' < "$destfile"); then
log "Received ${objcount} ${kind} objects"
return 0
Expand Down