Another break-time post from the continuous tutorial about cloud native applications 🙂
Sometimes when we are working in container environment, we found server’s version is not the same as client’s version. So we can not connect to the server. To easily solve this issue, we should install dvm (docker version manager) so we can easily move from one environment in our client to another.
These are the steps:
$ curl -sL https://download.getcarina.com/dvm/latest/install.sh | sh
$ source /Users/doddipriyambodo/.dvm/dvm.sh
#Usages of the commands:
$ dvm ls --> see the version in your client
$ dvm ls-remote --> see what version available to install
$ dmv install 1.12.3 --> install the client
$ dvm use 1.12.3 --> use the specified client
$ dvm deactivate --> uninstall the client
Following our tutorial, now we will continue to do the installation and configuration for those components.
So, rephrasing previous blog post. By utilising vSphere Integrated Containers, now Developers can use their docker commands to manage the development environments, also functionalities are enriched with specific container management portal (VMware Admiral) and enterprise features container registry (VMware Harbor). System administrator can still use their favourite management tool to manage the infrastructure, such as vCenter and also vRealize Operations plus Log Insight to manage the virtual infrastructure in a whole holistic view. Shown in the diagram below:
A traditional container environment use the host/server to handle several containers. Docker has the ability to import images into the host, but the resource is tied to that host. The challenge is sometime that host has a very limited set of resources. To expand resource on that host, then we need to shutdown the host and then the containers. Then we need to add resource for that physical/virtual machine before more containers can be powered deployed. Another challenge is the container is not portable as it can not be moved to another host since it is very tight to the OS kernel of the container host.
Another concerns other than resources, already explained in my earlier post regarding some enterprise features if we would like to run docker in production environment such as security, manageability, availability, diagnosis and monitoring, high availability, disaster recovery, etc. VIC (vSphere Integrated Containers) can give the solution for all those concerns by using resource pool as the container host and virtual machines as the containers. Plus with new features of vSphere 6 about Instant Clone now VIC can deliver “instant on” container experience alongside the security, portability, and isolation of Virtual Machine. Adding extra hosts in the resource pool to dynamically increase infra resources, initiate live migration/vMotion, auto placement/Distributed Resource Scheduler, dedicated placement/affinity, self healing/High Availability, QoS/weight, quota/limit, guarantee/reservation, etc will add a lot of benefits to the docker environment.
So, these are our steps to prepare the environments for vSphere Integrated Containers (VIC).
Installation and configuration of vSphere Integrated Containers
Installation and configuration of Harbor
Installation and configuration of Admiral
So, let’s start the tutorial now.
Checking the Virtual Infrastructure Environments
I am running my virtualisation infrastructure in my Mac laptop using VMware Fusion Professional 8.5.1.
Currently I am using vSphere ESXi Enterprise Plus version 6 update 2, and vCenter Standard version 6 update 2.
I have NFS storage as my centralised storage, NTP, DNS and DHCP also configured in another VM.
Installation of vSphere Integrated Containers (VIC)
There are two approach to install VIC. This is the first one: (I use this to install on my laptop)
Download that binary to the Virtual Machine that you will be used for VIC Management Host.
Extract the file using = $ tar -zxvf vic_6511.tar.gz. NOTE:You will see the latest build as shown here. The build number “6511” will be different as this is an active project and new builds are uploaded constantly.
Okay, you already installed the installer now. In those steps above, there are three primary components generated by a full build, found in the ./bin directory by defaul). The make targets used are the following:
vic-machine – make vic-machine
appliance.iso – make appliance
bootstrap.iso – make bootstrap
Okay, after this we will Deploy our Virtual Container Host in VMware environments (I am using vCenter with ESXi as explained earlier). The installation can run on dedicated ESXi host too (without vCenter) if needed.
Now, continue to create the Virtual Container Host in the vCenter. Since I am using Mac, I will use command prompt for mac.
After that command above, let’s check the condition of our virtual infrastructure from vCenter now. Currently we will see that we have a new resource pool as the virtual container host, and a vm as an endpoint vm as a target of the container host.
Okay, installation is completed. Let’s try to deploy a docker machine into the VIC now.
$ docker -H 172.16.159.153:2376 --tls info
After that, let’s do the pull and run command for the docker as normal operation same as my previous posts. $ docker -H 172.16.159.153:2376 --tls \
--tlskey='./docker-appliance-key.pem' pull vmwarecna/nginx $ docker -H 172.16.159.153:2376 --tls \
--tlskey='./docker-appliance-key.pem' run -d -p 80:80 vmwarecna/nginx
Note: for production, we must use the *.pem key to connect to the environment. Since this is my development environment, so I will skip that.
Okay, now finally… this is a video to explain the operational of vSphere Integrated Container, VMware Admiral, and VMware Harbor (I already explained about Admiral and Harbor in my previous blog post in here):
As previous post, I will elaborate about Cloud Native Applications. But before that, I will post some basic concepts about Docker as the Container technology for Cloud Native Applications approach.
Docker is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. With Docker, you can manage your infrastructure in the same ways you manage your applications. By taking advantage of Docker’s methodologies for shipping, testing, and deploying code quickly, you can significantly reduce the delay between writing code and running it in production.
In this post, I will start with the basic on how to run your first application in Docker that will be provisioned in your Mac laptop. Then, I will do that also in vSphere Integrated Container and also VMware Photon Platform.
Actually there are two approach to run docker on your Mac. The 1st one is to utilise Docker for Mac (which we will do this), and the second one is to utilise Docker Toolbox. The difference is in Docker for Mac approach, we will utilise HyperKit as lightweight virtualisation technology to run the container. Docker Toolbox will utilise Virtualbox as the virtualisation technology.
Actually you can run both Docker for Mac and Docker Toolbox approach at the same time in your MacOS, but there are several things that you need to do, such as create different environment (set and unset command). I will not elaborate that in this post.
Assume that your machine is empty for Docker engine.
Install and Run Docker. Double click Docker.img that you have downloaded earlier to start the installation.
Check Docker version that is now running on your Mac after the installation is completed.
Let’s start with your basic application. Let’s do nginx web server using docker.
Check your http://localhost first to check the status.
Basically, docker will try to run the source of your application locally. But if docker can not find it, then it will search through the public repository (default configuration is docker hub).
Check your http://localhost now to check the status.
Check the status of the docker using docker ps command. If you want to stop the web server, do docker stop webserver and start the web by docker start webserver
If you want to stop and remove the container, use the command docker rm -f webserver. If you want to delete the local images do the command docker rmi nginx. But before that, you can list the local images using docker images.
If you want to use another docker repository other than https://hub.docker.com or do a file sharing from your Mac to your docker engine, you can also configure that in the Docker for Mac menu.
Let’s Continue with the second Chapter: BOARDING YOUR APPS
For this example we will utilise Docker Compose to run WordPress in an isolated environment. Compose is a docker tool for running multi containers environment. We will create a compose file, and then execute the YAML file using docker-compose command.
Create a directory for the project in your Mac.
Create a docker compose file. This will include wordpress and mysql to create a simple blog website.
Now, build the project using the command $ docker-compose up -d
Check whether the images already installed and run. Using docker images and docker ps command.
Finally, test to open the wordpress in your browser. Because we put the configuration in port 8000, then we will open http://localhost:8000
Do the installations of wordpress using the UI wizard, then finally open the created site.