vSphere with Tanzu using NSX-T - Part5 - Tier-1 Gateway and Segments

In the previous posts we discussed the following: 

Part1: Prerequisites

Part2: Configure NSX-T

Part3: Edge Cluster

Part4: Tier-0 Gateway and BGP peering

The next step is to create a Tier-1 Gateway and network segments. 

• Add Tier-1 Gateway.
• Provide name, select the linked T0 Gateway, and select the route advertisement settings.

• Add Segment.
• Provide segment name, connected gateway, transport zone, and subnet.
• Here we are creating an overlay segment and the subnet CIDR 172.16.10.1/24 will be the gateway IP for this segment.

Now, let's verify whether this segment is being advertised (route advertisement) or not. Following is the screenshot from both edge nodes and you can see that the Tier-0 SR is aware of 172.16.10.0/24 network:

As Tier-0 Gateway is connected to the TOR switches via BGP, we can verify whether the TOR switches are aware about this newly created segment. 

You can see that the TORs are aware of 172.16.10.0/24 network via BGP. Let's connect a VM to this segment, assign an IP address, and test network connectivity. 

You can also view the network topology from NSX-T.

This is the traffic flow: VM - Network segment - Tier-1 Gateway - Tier-0 Gateway - BGP peering - TOR switches - NAT VM - External network.

Hope this was useful. Cheers!

Docker 101 - Part4 - Creating images using dockerfile

In this article, I will briefly explain how to create your own image using Dockerfile. For example, I will be creating an FIO image. FIO is a storage stress test tool and this image can be used for container storage IO benchmarking/ testing.

• Login to the CentOS docker host.
• Create a file named "Dockerfile".
• # vi Dockerfile
• Add the below two lines and save it.

• # docker build ./

• Once the build is complete, it returns the IMAGE ID as shown below.
• You can use the "docker tag" command to mention a repository and tag to the image. 

• At this stage, as shown in the above screenshot, the FIO image is created with repository "vineethac/fio_image" and tagged as "latest".
• You can run this image as given below.

• # docker run -dit --name FIO_test01 --mount source=disk_data,target=/vol vineethac/fio_image fio --name=RandomReadTest1 --readwrite=randread --rwmixwrite=0 --bs=4k --invalidate=1 --direct=1 --filename=/vol/newfile --size=10g --time_based --runtime=300 --ioengine=libaio --numjobs=2 --iodepth=1 --norandommap --randrepeat=0 --exitall

• The above command will start a container with FIO application running inside it. FIO will use "/vol/newfile" for IO tests. "/vol" is using "disk_data" directory which is inside "/var/lib/docker/volumes". Once the test is complete, the container will exit.

Hope it was useful. Cheers!

Related posts

Docker 101 - Part3 - Persisting data using volumes

Docker 101 - Part2 - Basic operations

Docker 101 - Part1 - Installation

Docker 101 - Part2 - Basic operations

In this article, I will walk you through basic Docker commands and how to work with it for creating, managing, and monitoring Docker containers.

Docker version and info

#docker version

#docker info

Default directory for Docker

#cd /var/lib/docker

Pull images

#docker pull centos:latest 

List images

#docker images

Create bridge network

#docker network create -d bridge --subnet 10.0.0.0/24 ps-bridge

List all bridge networks

#brctl show

Inspect a network 

#docker network ls
#docker network inspect <name>

Run a container

#docker run -dt --name centos_test --network ps-bridge centos sleep 900

SSH into a container

#docker exec -it <name> sh

List running containers

#docker ps

List all containers

#docker ps -a

List container stats

#docker stats

Stop a container

#docker stop <Container ID>

Remove a container

#docker rm <Container ID>

Remove an image

#docker rmi <REPOSITORY:TAG>

Hope it was useful. Cheers!

Related posts

Docker 101 - Part1 - Installation

References

https://app.pluralsight.com/library/courses/docker-getting-started/table-of-contents