mirror of
https://github.com/kubernetes/node-problem-detector.git
synced 2026-02-14 18:09:57 +00:00
a91b568149
- Script was checking for "ip_conntrack_..." which was replaced by "nf_conntrack_..." on newer system. Now support both.
- Return failure ("not ok") when table is more than 90% full.
- Not sure what value is best here but I think that is better than when the table is full.
Otherwise we might end up with a value close to the max or bouncing around.
- Replaced cat by "$(< file )" to avoid calling external command
- Follow Google "Shell Style Guide": 2 space indent, use preferred "[[ test ]]", add "readonly"
- Include current connection usage in output message
37 lines
1.2 KiB
Bash
Executable File
37 lines
1.2 KiB
Bash
Executable File
#!/bin/bash
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# This plugin checks for common network issues.
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# Currently only checks if conntrack table is more than 90% used.
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readonly OK=0
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readonly NONOK=1
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readonly UNKNOWN=2
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# "nf_conntrack" replaces "ip_conntrack" - support both
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readonly NF_CT_COUNT_PATH='/proc/sys/net/netfilter/nf_conntrack_count'
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readonly NF_CT_MAX_PATH='/proc/sys/net/netfilter/nf_conntrack_max'
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readonly IP_CT_COUNT_PATH='/proc/sys/net/ipv4/netfilter/ip_conntrack_count'
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readonly IP_CT_MAX_PATH='/proc/sys/net/ipv4/netfilter/ip_conntrack_max'
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if [[ -f $NF_CT_COUNT_PATH ]] && [[ -f $NF_CT_MAX_PATH ]]; then
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readonly CT_COUNT_PATH=$NF_CT_COUNT_PATH
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readonly CT_MAX_PATH=$NF_CT_MAX_PATH
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elif [[ -f $IP_CT_COUNT_PATH ]] && [[ -f $IP_CT_MAX_PATH ]]; then
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readonly CT_COUNT_PATH=$IP_CT_COUNT_PATH
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readonly CT_MAX_PATH=$IP_CT_MAX_PATH
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else
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exit $UNKNOWN
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fi
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readonly conntrack_count=$(< $CT_COUNT_PATH) || exit $UNKNOWN
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readonly conntrack_max=$(< $CT_MAX_PATH) || exit $UNKNOWN
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readonly conntrack_usage_msg="${conntrack_count} out of ${conntrack_max}"
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if (( conntrack_count > conntrack_max * 9 /10 )); then
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echo "Conntrack table usage over 90%: ${conntrack_usage_msg}"
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exit $NONOK
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else
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echo "Conntrack table usage: ${conntrack_usage_msg}"
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exit $OK
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fi
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