docker-sysctl.sh

docker-sysctl.sh

#!/bin/bash

# from https://blog.codeship.com/running-1000-containers-in-docker-swarm/
SYSCTL='
net.ipv4.ip_local_port_range="1024 65000"
net.core.somaxconn=4096
net.netfilter.nf_conntrack_max=262144
net.netfilter.nf_conntrack_tcp_timeout_established=86400
'

  date
  containers=$(docker ps --format "{{.Names}}:{{.ID}}")
  for c in $containers
  do
      echo $c
      CID=$(echo $c | awk -F ":" '{print $2}')
      echo "${SYSCTL}" | xargs -n 1 nsenter -t $(docker inspect -f '{{.State.Pid}}' $CID) -n sysctl -w
      echo ----------------------
  done
  echo ==================