My ISP has given me a 10 IP addresses. x.x.x.91-95 and x.x.x.161-165
I want to use 9 of them for my containers.
I have the host eth0 on x.x.x.91
So I did:
docker network create --subnet x.x.x.0/24 --gateway x.x.x.254 mynet
and then
docker run -it --net mynet --ip x.x.x.165 ubuntu /bin/bash
But I can't connect out
PING 8.8.8.8 (8.8.8.8): 56 data bytes
3 packets transmitted, 0 packets received, 100% packet loss
# ifconfig
eth0 Link encap:Ethernet HWaddr 02:42:5b:cc:d2:a5
inet addr:x.x.x.165 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1296 (1.2 KB) TX bytes:504 (504.0 B)
# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 x.x.x.254 0.0.0.0 UG 0 0 0 eth0
x.x.x.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
Any ideas?
Docker version 17.09.0-ce, build afdb6d4
I switched to the Macvlan driver (as suggested by Matt)
https://docs.docker.com/engine/userguide/networking/get-started-macvlan/
Related
I need to use gdbserver in a docker container.
As the use of gdb in the host is scripted I need to set a static IP for my container.
The output of ifconfig is :
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
inet6 ****::**:****:****:**** prefixlen 64 scopeid 0x20<link>
ether **:**:**:**:**:** txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 60 bytes 8931 (8.9 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
I have tried :
docker run --name "myContainerName" --ip 172.17.0.124 --rm -it -p 7777:7777 myImgae /bin/bash
But inside the docker I get the output of ifconfig :
eth0 Link encap:Ethernet HWaddr ***:**:**:**:**:**
inet addr:172.17.0.2 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2282 (2.2 KiB) TX bytes:0 (0.0 B)
The IP of my container is 172.17.0.2 and not 172.17.0.124 as I want
So I am wondering how the ip option works with the default subnet (docker0)
As suggested by an answer,
I found a workaround using "localhost" for my debuggind session instead of a specific ip address
I'm trying to configure a Docker network using the macvlan driver, but my containers can't reach the gateway or the WAN.
The network is set up like so:
docker network create -d macvlan --subnet=10.1.1.0/24 --ip-range=10.1.1.160/28 --gateway=10.1.1.1 -o parent=ens160 pub_net
The host OS is Ubuntu 16.04, which itself is a VM running on ESXi (lots of layers, I know). The ens160 interface is connected to an ESXi vSwitch ("LAN"). The gateway (10.1.1.1) is a pfSense VM on the same machine, and connected to the same "LAN" vSwitch. The pfSense VM is also connected to a "WAN" vSwitch which physically connects to the upstream network. The Ubuntu host OS has an IP and full WAN connectivity, but the Docker container does not.
Some details about the Ubuntu host:
host$ ifconfig
docker0 Link encap:Ethernet HWaddr aa:bb:cc:00:e2:77
inet addr:172.17.0.1 Bcast:0.0.0.0 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
ens160 Link encap:Ethernet HWaddr aa:bb:cc:9b:be:f2
inet addr:10.1.1.22 Bcast:10.1.1.255 Mask:255.255.255.0
inet6 addr: fe80::c7b7:d64c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:64642 errors:0 dropped:0 overruns:0 frame:0
TX packets:1881 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:19190911 (19.1 MB) TX bytes:169266 (169.2 KB)
ens192 Link encap:Ethernet HWaddr aa:bb:cc:9b:be:fc
inet addr:10.2.2.22 Bcast:10.2.2.255 Mask:255.255.255.0
inet6 addr: fe80::bb15:267d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:294 errors:0 dropped:10 overruns:0 frame:0
TX packets:515 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:57996 (57.9 KB) TX bytes:63258 (63.2 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:2637 errors:0 dropped:0 overruns:0 frame:0
TX packets:2637 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:204727 (204.7 KB) TX bytes:204727 (204.7 KB)
host$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.2.2.1 0.0.0.0 UG 100 0 0 ens192
0.0.0.0 10.1.1.1 0.0.0.0 UG 101 0 0 ens160
10.1.1.0 0.0.0.0 255.255.255.0 U 100 0 0 ens160
10.2.2.0 0.0.0.0 255.255.255.0 U 100 0 0 ens192
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 ens192
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
Switching to the Docker container, and details there:
host$ sudo docker run --net=pub_net -it alpine /bin/sh
container$ ifconfig
eth0 Link encap:Ethernet HWaddr AA:BB:CC:01:01:A0
inet addr:10.1.1.160 Bcast:0.0.0.0 Mask:255.255.255.0
inet6 addr: fe80::42:1a0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:15 errors:0 dropped:0 overruns:0 frame:0
TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1789 (1.7 KiB) TX bytes:634 (634.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:2 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:224 (224.0 B) TX bytes:224 (224.0 B)
container$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.1.1.1 0.0.0.0 UG 0 0 0 eth0
10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
As mentioned, if I ping 10.1.1.1 (or any other external IP) from within the container I get no response. If I ping another Docker container on the same host I do get a response.
What do I need to change so that the container can reach the WAN?
You need to turn on promiscuous mode and allow forged transmits for your LAN vSwitch. This is because macvlan mode requires the guest to be listening for the falsified MAC addresses as well as be able to falsify MAC addresses.
VMware Knowledge Base article on promiscuous mode
VMware documentation on forged transmits
I've setup a CoreOs host with a public routable /64 ipv6 Subnet.
From within the host i have a global ipv6 address which is working fine but i can't get access to ipv6 hosts from within any docker container.
These are my current settings to my docker deamon:
DOCKER_OPTS=--dns 8.8.8.8 --dns 8.8.4.4 --ipv6 --fixed-cidr-v6='2a03:4000:6:e0d0::/64'
Adding --ip-forward=false or the google ipv6 DNS servers doesn't help either
Only if I add --net=host it works so I think I'm missing a fundamental network configuration part.
ifconfig from within an ubuntu:latest docker container shows this:
eth0 Link encap:Ethernet HWaddr 02:42:ac:11:00:02
inet addr:172.17.0.2 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::42:acff:fe11:2/64 Scope:Link
inet6 addr: 2a03:4000:6:e0d0:0:242:ac11:2/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:19 errors:0 dropped:4 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1565 (1.5 KB) TX bytes:676 (676.0 B)
What special configuration do i need to do to get this working?
Here is how I run my docker container -
docker run --name docker-test-server -p 5000:5000 -p 4444:4444
Container OS - Ubuntu 14.04 LTS
Now since I have mapped 4444 of container to that of machine, I try to connect -
root#localhost:/var/repo# nc -vz 127.0.0.1 4444
Connection to 127.0.0.1 4444 port [tcp/*] succeeded!
Now I enter the shell -
docker exec -it docker-test-server /bin/bash
Successfully entering, I try to get the IP address of the machine.
root#ec919687cda8:/# ifconfig
eth0 Link encap:Ethernet HWaddr 02:42:ac:11:00:09
inet addr:172.17.0.9 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::42:acff:fe11:9/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2227 errors:0 dropped:0 overruns:0 frame:0
TX packets:2199 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:166686 (166.6 KB) TX bytes:121473 (121.4 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Now I come out of the container, and try to connect to the container from the machine where the container is running by providing the IP address of container found in ifconfig -
nc -vz 172.17.0.9 4444
nc: connect to 172.17.0.9 port 4444 (tcp) failed: Connection refused
Could someone, please explain me
why am I unable to connect to the machine?
What can I do to connect to the machine?
I am running a bare container that just installs ubuntu 14.04 and exposes 2 ports. Nothing fancy.
Thanks.
You need to either disable the firewall or add port to your ubuntu firewall by using sudo ufw disable or sudo ufw
I was also facing the same issue but instead of connection refused, I got timeout.
I want to specify the docker container's IP address range to the host's, which has also been realized followed this tutor, WHILE it is still inaccessible to the global network. Of course I have checked the IP specified through ifconfig.
THEN, could you give me some suggestion or solution to this problem?
root#ubuntu:~# brctl show
bridge name bridge id STP enabled interfaces
docker0 8000.000000000000 no
root#ubuntu:~# brctl addbr bridge0
root#ubuntu:~# ip addr add 10.0.3.1/24 dev bridge0
root#ubuntu:~# ip link set dev bridge0 up
root#ubuntu:~# ip addr show bridge0
4: bridge0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
link/ether 0e:3a:46:ac:fe:57 brd ff:ff:ff:ff:ff:ff
inet 10.0.3.1/24 scope global bridge0
inet6 fe80::c3a:46ff:feac:fe57/64 scope link
valid_lft forever preferred_lft forever
root#ubuntu:~# echo 'DOCKER_OPTS="-b=bridge0"' >> /etc/default/docker
root#ubuntu:~# service docker restart
docker stop/waiting
docker start/running, process 3166
Then, I run ubuntu:14.04 container
root#ubuntu:~# docker run -t -i ubuntu:14.04 /bin/bash
root#630046b814dc:/# ifconfig
eth0 Link encap:Ethernet HWaddr 02:42:0a:00:03:02
inet addr:10.0.3.2 Bcast:0.0.0.0 Mask:255.255.255.0
inet6 addr: fe80::42:aff:fe00:302/64 Scope:Link
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:3 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:238 (238.0 B) TX bytes:328 (328.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
When I try ping host IP
root#630046b814dc:/# ping 10.0.3.87
PING 10.0.3.87 (10.0.3.87) 56(84) bytes of data.
From 10.0.3.2 icmp_seq=1 Destination Host Unreachable
From 10.0.3.2 icmp_seq=2 Destination Host Unreachable
From 10.0.3.2 icmp_seq=3 Destination Host Unreachable