59 lines
2.4 KiB
Bash
59 lines
2.4 KiB
Bash
#!/bin/bash
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chain_exists() {
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[ $# -lt 1 -o $# -gt 2 ] && {
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echo "Usage: chain_exists <chain_name> [table]" >&2
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return 1
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}
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local chain_name="$1" ; shift
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[ $# -eq 1 ] && local table="--table $1"
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iptables $table -n --list "$chain_name" >/dev/null 2>&1
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}
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DOCKER_INT="docker0"
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DOCKER_NETWORK="172.17.0.0/16"
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iptables-save | grep -v -- '-j DOCKER' | iptables-restore
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chain_exists DOCKER && iptables -X DOCKER
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chain_exists DOCKER nat && iptables -t nat -X DOCKER
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iptables -N DOCKER
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iptables -t nat -N DOCKER
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iptables -A FORWARD -o ${DOCKER_INT} -j DOCKER
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iptables -A FORWARD -o ${DOCKER_INT} -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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iptables -A FORWARD -i ${DOCKER_INT} ! -o ${DOCKER_INT} -j ACCEPT
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iptables -A FORWARD -i ${DOCKER_INT} -o ${DOCKER_INT} -j ACCEPT
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iptables -t nat -A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
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iptables -t nat -A OUTPUT ! -d 127.0.0.0/8 -m addrtype --dst-type LOCAL -j DOCKER
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iptables -t nat -A POSTROUTING -s ${DOCKER_NETWORK} ! -o ${DOCKER_INT} -j MASQUERADE
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containers=`docker ps -q`
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if [ `echo ${containers} | wc -c` -gt "1" ] ; then
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for container in ${containers} ; do
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rules=`docker port ${container} | sed 's/ //g'`
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if [ `echo ${rules} | wc -c` -gt "1" ] ; then
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ipaddr=`docker inspect -f "{{.NetworkSettings.IPAddress}}" ${container}`
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for rule in ${rules} ; do
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src=`echo ${rule} | awk -F'->' '{ print $2 }'`
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dst=`echo ${rule} | awk -F'->' '{ print $1 }'`
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src_ip=`echo ${src} | awk -F':' '{ print $1 }'`
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src_port=`echo ${src} | awk -F':' '{ print $2 }'`
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dst_port=`echo ${dst} | awk -F'/' '{ print $1 }'`
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dst_proto=`echo ${dst} | awk -F'/' '{ print $2 }'`
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iptables -A DOCKER -d ${ipaddr}/32 ! -i ${DOCKER_INT} -o ${DOCKER_INT} -p ${dst_proto} -m ${dst_proto} --dport ${dst_port} -j ACCEPT
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iptables -t nat -A POSTROUTING -s ${ipaddr}/32 -d ${ipaddr}/32 -p ${dst_proto} -m ${dst_proto} --dport ${dst_port} -j MASQUERADE
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iptables -t nat -A DOCKER ! -i ${DOCKER_INT} -p ${dst_proto} -m ${dst_proto} --dport ${src_port} -j DNAT --to-destination ${ipaddr}:${dst_port}
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done
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fi
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done
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fi
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