1ae18a54f9
- use baseruntime:latest as base image - reimplement cgroup-limits in shell - take real memory size into account for configuration - don't use nss_wrapper.so - don't reference separate shared-userspace repo - fix usage label - get rid of /var/lib/psql <-> .../data distinction - drop a few unused files from root/
99 lines
3.2 KiB
Bash
Executable file
99 lines
3.2 KiB
Bash
Executable file
#!/bin/bash
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# Script for parsing cgroup information
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#
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# This script will read some limits from the cgroup system and parse
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# them, printing out "VARIABLE=VALUE" on each line for every limit that is
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# successfully read. Output of this script can be directly fed into
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# bash's export command. Recommended usage from a bash script:
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#
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# set -o errexit
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# export_vars=$(cgroup-limits) ; export $export_vars
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#
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# Variables currently supported:
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# MAX_MEMORY_LIMIT_IN_BYTES
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# Maximum possible limit MEMORY_LIMIT_IN_BYTES can have. This is
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# currently a constant value of 9223372036854775807.
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# MEMORY_LIMIT_IN_BYTES
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# Maximum amount of user memory in bytes. If this value is set
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# to the same value as MAX_MEMORY_LIMIT_IN_BYTES, it means that
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# there is no limit set. The value is taken from
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# /sys/fs/cgroup/memory/memory.limit_in_bytes
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# RAM_SIZE_IN_BYTES
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# Available memory in bytes. The value is taken from /proc/meminfo.
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# NUMBER_OF_CORES
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# Number of detected CPU cores that can be used. This value is
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# calculated from /sys/fs/cgroup/cpuset/cpuset.cpus
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# NO_MEMORY_LIMIT
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# Set to "true" if MEMORY_LIMIT_IN_BYTES is so high that the caller
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# can act as if no memory limit was set. Undefined otherwise.
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get_memory_limit() {
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local limit="$(cat /sys/fs/cgroup/memory/memory.limit_in_bytes)"
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if [ $? -eq 0 ]; then
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echo "$limit"
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else
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echo "Warning: Can't detect memory limit from cgroups" >&2
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fi
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}
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get_meminfo_ram_size() {
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local limit="$(cat /proc/meminfo | while read key val unit rest; do if [ "$key" = "MemTotal:" ]; then echo "$val $unit"; break; fi; done)"
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if [ $? -eq 0 ]; then
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local val="${limit/ *}"
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local unit="${limit/* }"
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case "$unit" in
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kB)
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val=$(($val * 1024))
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;;
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MB)
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val=$(($val * 1024 * 1024))
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;;
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GB)
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val=$(($val * 1024 * 1024 * 1024))
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;;
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esac
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echo "$val"
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else
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echo "Warning: Can't detect RAM site from /proc/meminfo." >&2
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fi
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}
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get_number_of_cores() {
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local core_count=0
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local group
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local sysfs_cpus="$(cat /sys/fs/cgroup/cpuset/cpuset.cpus)"
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if [ $? -eq 0 ]; then
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for group in ${sysfs_cpus//,/ }; do
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local from="${group%-*}"
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local to="${group#*-}"
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core_count=$(($core_count + $to - $from + 1))
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done
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echo "$core_count"
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else
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echo "Warning: Can't detect number of CPU cores from cgroups" >&2
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fi
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}
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MAX_MEMORY_LIMIT_IN_BYTES=9223372036854775807
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MEMORY_LIMIT_IN_BYTES="$(get_memory_limit)"
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RAM_SIZE_IN_BYTES="$(get_meminfo_ram_size)"
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NUMBER_OF_CORES="$(get_number_of_cores)"
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echo "MAX_MEMORY_LIMIT_IN_BYTES=$MAX_MEMORY_LIMIT_IN_BYTES"
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if [ -n "$MEMORY_LIMIT_IN_BYTES" ]; then
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echo "MEMORY_LIMIT_IN_BYTES=$MEMORY_LIMIT_IN_BYTES"
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if [ "$MEMORY_LIMIT_IN_BYTES" -ge "$MAX_MEMORY_LIMIT_IN_BYTES" ]; then
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echo "NO_MEMORY_LIMIT=true"
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fi
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fi
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if [ -n "$RAM_SIZE_IN_BYTES" ]; then
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echo "RAM_SIZE_IN_BYTES=$RAM_SIZE_IN_BYTES"
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fi
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if [ -n "$NUMBER_OF_CORES" ]; then
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echo "NUMBER_OF_CORES=$NUMBER_OF_CORES"
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fi
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