Separated names of docker VLAN network and routing interface

Author: sarunas-zilinskas

Enable-host-to-container-networking.sh

@@ -2,12 +2,12 @@
 
 #Change these variables!
 NIC_NAME="eth0"
-DOCKERNETWORK_NAME="dockervlan"
+DOCKER_ROUTING_INTERFACE_NAME="dockerrouteif"
 DOCKERNETWORK_IP_ADDRESS="192.168.0.249/32"
 DOCKERNETWORK_IP_RANGE="192.168.0.64/26"
 
 sleep 15 #Do not rush things if executing during boot. This line is not mandatory and can be removed.
 
 
-ip link add ${DOCKERNETWORK_NAME} link ${NIC_NAME}type macvlan mode bridge ; ip addr add ${DOCKERNETWORK_IP_ADDRESS} dev ${DOCKERNETWORK_NAME} ; ip link set ${DOCKERNETWORK_NAME} up
-ip route add ${DOCKERNETWORK_IP_RANGE} dev ${DOCKERNETWORK_NAME}
+ip link add ${DOCKER_ROUTING_INTERFACE_NAME} link ${NIC_NAME}type macvlan mode bridge ; ip addr add ${DOCKERNETWORK_IP_ADDRESS} dev ${DOCKER_ROUTING_INTERFACE_NAME} ; ip link set ${DOCKER_ROUTING_INTERFACE_NAME} up
+ip route add ${DOCKERNETWORK_IP_RANGE} dev ${DOCKER_ROUTING_INTERFACE_NAME}

README.md

@@ -10,19 +10,19 @@ You can reach the container with custom defined IP address from any host on the
 Check the **Enable-host-to-container-networking.sh** script file or manual steps defined.   
 For making container accessible within the same host - one needs to create ethernet interface and route the containers used IP address (or range) trough the new interface:   
 
-* Create new interface (Interface name is *dockervlan*, and *eth0* is the host interface):  
-`ip link add dockervlan link eth0 type macvlan mode bridge`
+* Create new interface (Interface name is *dockerrouteif*, and *eth0* is the host interface):  
+`ip link add dockerrouteif link eth0 type macvlan mode bridge`
 
 * Then assign IP address to that interface (Imagine it as a gateway - just like a router works but without NAT). In this example I used 192.168.0.249:  
-`ip addr add 192.168.0.249/32 dev dockervlan`  
+`ip addr add 192.168.0.249/32 dev dockerrouteif`  
 **NOTE: Ensure defined IP address is not used by another host/device/container though!**  
 **NOTE: If you check logs i.e. host is using DNS server which is in a container, any requests made from the host will be seen as coming from this IP**  
 
 * Bring up that interface:  
-`ip link set dockervlan up`
+`ip link set dockerrouteif up`
 
 * And finally define a range which should be routed trough that iterface:  
-`ip route add 192.168.0.64/26 dev dockervlan`
+`ip route add 192.168.0.64/26 dev dockerrouteif`
 
 Lastly, bring up the docker compose file:  
 `docker-compose up -d`  
@@ -33,6 +33,7 @@ Host interface name: `eth0`
 Gateway: `192.168.0.1`  
 Subnet: `192.168.0.0/24`  
 Host IP: `192.168.0.2`  
-Interface name trough which traffic is routed: `dockervlan`  
+Interface name trough which traffic is routed: `dockerrouteif`  
+Docker VLAN name: `Dockervlan`
 Dockervlan interface IP: `192.168.0.249`  
 dockervlan routed IP range: `192.168.0.64/26`  

ansible/playbooks/playbook.yml

@@ -4,6 +4,7 @@
         username: "user" #home dir username i.e. /home/user/
         nic_name: "eth0" #Host nic interface name
         dockernetwork_name: "dockervlan"
+        docker_routing_interface_name: "dockerrouteif"
         network_subnet: "192.168.0.0/24"
         network_ip_range: "192.168.0.64/26"
         network_gateway: "192.168.0.1"

ansible/playbooks/roles/docker-compose-macvlan/templates/Enable-host-to-container-networking.sh.j2

@@ -2,5 +2,5 @@
 
 sleep 15 #Do not rush things if executing during boot. This line is not mandatory and can be removed.
 
-ip link add {{ dockernetwork_name }} link {{ nic_name }} type macvlan mode bridge ; ip addr add {{ dockernetwork_ip_address }} dev {{ dockernetwork_name }} ; ip link set {{ dockernetwork_name }} up
-ip route add {{ dockernetwork_ip_range }} dev {{ dockernetwork_name }}
+ip link add {{ docker_routing_interface_name }} link {{ nic_name }} type macvlan mode bridge ; ip addr add {{ dockernetwork_ip_address }} dev {{ docker_routing_interface_name }} ; ip link set {{ docker_routing_interface_name }} up
+ip route add {{ dockernetwork_ip_range }} dev {{ docker_routing_interface_name }}