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Add check for IP overlap in support.sh

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Add a simple check and a summary report for the support script.

Report:
==SUMMARY==
         Processed 3 networks
         IP overlap found: 1
         Processed 167 containers

Overlap found:
*** OVERLAP on Network 0ewr5iqraa8zv9l4qskp93wxo ***
      2  "192.168.1.138",

Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com>
This commit is contained in:
Flavio Crisciani 2018-03-05 10:14:53 -08:00
parent 9bade4d29c
commit cf89f97a14
1 changed files with 26 additions and 1 deletions
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27
libnetwork/support.sh
View file

@ -8,6 +8,10 @@ IPTABLES="${IPTABLES:-iptables}"
IPVSADM="${IPVSADM:-ipvsadm}"
IP="${IP:-ip}"
networks=0
containers=0
ip_overlap=0
NSDIR=/var/run/docker/netns
function die {
@ -20,6 +24,18 @@ function echo_and_run {
eval $(printf '%q ' "$@") < /dev/stdout
}
function check_ip_overlap {
inspect=$1
overlap=$(echo "$inspect_output" | grep "EndpointIP\|VIP" | awk -F ':' '{print $2}' | sort | uniq -c | grep -v "1 ")
if [ ! -z "$overlap" ]; then
echo -e "\n\n*** OVERLAP on Network ${networkID} ***";
echo -e "${overlap} \n\n"
((ip_overlap++))
else
echo "No overlap"
fi
}
type -P ${DOCKER} > /dev/null || echo "This tool requires the docker binary"
type -P ${NSENTER} > /dev/null || echo "This tool requires nsenter"
type -P ${BRIDGE} > /dev/null || echo "This tool requires bridge"
@ -49,7 +65,9 @@ for networkID in $(${DOCKER} network ls --no-trunc --filter driver=overlay -q) "
echo "nnn Network ${networkID}"
if [ "${networkID}" != "ingress_sbox" ]; then
nspath=(${NSDIR}/*-${networkID:0:10})
${DOCKER} network inspect ${NETINSPECT_VERBOSE_SUPPORT} ${networkID}
inspect_output=$(${DOCKER} network inspect ${NETINSPECT_VERBOSE_SUPPORT} ${networkID})
echo "$inspect_output"
check_ip_overlap $inspect_output
else
nspath=(${NSDIR}/${networkID})
fi
@ -62,6 +80,7 @@ for networkID in $(${DOCKER} network ls --no-trunc --filter driver=overlay -q) "
echo_and_run ${NSENTER} --net=${nspath[0]} ${IPTABLES} -w1 -n -v -L -t mangle | grep -v '^$'
echo_and_run ${NSENTER} --net=${nspath[0]} ${IPVSADM} -l -n
printf "\n"
((networks++))
done
echo "Container network configuration"
@ -76,4 +95,10 @@ for containerID in $(${DOCKER} container ls -q); do
echo_and_run ${NSENTER} --net=${nspath[0]} ${IPTABLES} -w1 -n -v -L -t mangle | grep -v '^$'
echo_and_run ${NSENTER} --net=${nspath[0]} ${IPVSADM} -l -n
printf "\n"
((containers++))
done
echo -e "\n\n==SUMMARY=="
echo -e "\t Processed $networks networks"
echo -e "\t IP overlap found: $ip_overlap"
echo -e "\t Processed $containers containers"