Saya memiliki wadah buruh pelabuhan yang beroperasi seperti:
docker run --name some_container_1 -p 8080:80 -d some_image
Itu bekerja dengan baik. Kontainer memperlihatkan port 80 hingga 8080 dan dapat diakses dari localhost.
Namun karena beberapa alasan mengabaikan aturan iptables INPUT sepenuhnya dan juga dapat diakses dari luar.
Bagaimana saya bisa membatasi akses ke wadah Docker saya hanya mengizinkan yaitu IP 123.456.789.0 untuk mengaksesnya dari eksternal?
Terima kasih.
iptables sudo -L -n -v --line-number
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
2 365 23380 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
3 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
4 7 788 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 limit: avg 5/min burst 5 LOG flags 0 level 7 prefix "iptables denied: "
5 7 788 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 24 1524 DOCKER all -- * docker0 0.0.0.0/0 0.0.0.0/0
2 0 0 ACCEPT all -- * docker0 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
3 15 13320 ACCEPT all -- docker0 !docker0 0.0.0.0/0 0.0.0.0/0
4 0 0 ACCEPT all -- docker0 docker0 0.0.0.0/0 0.0.0.0/0
Chain OUTPUT (policy ACCEPT 204 packets, 21792 bytes)
num pkts bytes target prot opt in out source destination
Chain DOCKER (1 references)
num pkts bytes target prot opt in out source destination
1 24 1524 ACCEPT tcp -- !docker0 docker0 0.0.0.0/0 172.17.0.2 tcp dpt:80
sudo iptables-save
# Generated by iptables-save v1.4.21 on Wed Apr 8 23:37:43 2015
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [100:16642]
:DOCKER - [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7
-A INPUT -j DROP
-A FORWARD -o docker0 -j DOCKER
-A FORWARD -o docker0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i docker0 ! -o docker0 -j ACCEPT
-A FORWARD -i docker0 -o docker0 -j ACCEPT
-A DOCKER -d 172.17.0.2/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 80 -j ACCEPT
COMMIT
# Completed on Wed Apr 8 23:37:43 2015
# Generated by iptables-save v1.4.21 on Wed Apr 8 23:37:43 2015
*nat
:PREROUTING ACCEPT [13:2206]
:INPUT ACCEPT [1:64]
:OUTPUT ACCEPT [4:268]
:POSTROUTING ACCEPT [4:268]
:DOCKER - [0:0]
-A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
-A OUTPUT ! -d 127.0.0.0/8 -m addrtype --dst-type LOCAL -j DOCKER
-A POSTROUTING -s 172.17.0.0/16 ! -o docker0 -j MASQUERADE
-A POSTROUTING -s 172.17.0.2/32 -d 172.17.0.2/32 -p tcp -m tcp --dport 80 -j MASQUERADE
-A DOCKER ! -i docker0 -p tcp -m tcp --dport 8080 -j DNAT --to-destination 172.17.0.2:80
COMMIT
# Completed on Wed Apr 8 23:37:43 2015
info buruh pelabuhan
Containers: 1
Images: 25
Storage Driver: aufs
Root Dir: /var/lib/docker/aufs
Backing Filesystem: extfs
Dirs: 27
Execution Driver: native-0.2
Kernel Version: 3.16.0-4-amd64
Operating System: Debian GNU/Linux 8 (jessie)
CPUs: 4
Total Memory: 7.746 GiB
Name: nuc-001
ID: WCMU:MN3T:VFKR:IU42:6423:OEI6:IB5Q:WBNV:K75H:JZDS:UWU5:57WD
WARNING: No memory limit support
WARNING: No swap limit support
iptables-save
? Saya curiga cara buruh pelabuhan melakukan terjemahan port adalah dengan aturan iptables via MASQUERADE / NAT, tapi saya tidak benar-benar tahu