CSE (Container Server Extenstion) is a extension for vCD that has been around for a while now, CSE is like PKS an VMware technology to run container based workloads in vCD. Implementing CSE in vCD, allows the tenant users to deploy kubernetes cluster as a service. VMware published a well documented GitHub page, where all the needed information can be found.
Prerequisites for Container server
As mentioned on the CSE GitHub page, there several prerequisites that need to be in place to implement CSE.
The prerequisites are:
- An org.
- A VDC within the org, whichhas an org VDC network connected to an external network (with Internet connectivity). The external network connection is required to enable cluster VMs to download packages during configuration.
- can host vApps
- has sufficient storage to create vApps and publish them as templates.
- Users in the org with privileges necessary to perform operations like configuring AMQP, creating public catalog entries, and managing vApps.
- A good network connectivity between the machine where CSE is installed and the vCD server as well as the Internet. This avoids intermittent failures in OVA upload/download operations.
Configuring prerequisites in vCloud Director
- Create a new Org:
2. Make sure that the following has been enabled on the Org:
3. Create a new OrgVDC and select the newly created Org as Organization.
4. Add a network to the new OrgVDC that has internet connectivity to download packages during the CSE configuration.
Installing the CSE server.
Installing OS and prerequisites
- Install CentOS with 2CPU and 4GB RAM of resources. (On the CSE github page, they do not specify the total amount of needed resources.)
- Install prerequisites for Python 3.7.3 before installing Python.
yum install gcc openssl-devel bzip2-devel libffi-devel
3. Download the Python version (3.7.3 or higher) you needed in an TGZ file format.
cd /usr/src wget https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tgz
4. With the following set of commands we can initiate the installation of Python.
Make altinstall is used to prevent replacing the default python binary file /usr/bin/python.
cd Python-3.7.4 ./configure --enable-optimizations make altinstall
5. Verify the Python version:
python3.7 --version Python 3.7.4
6. Download the get-pip.py file from pypa.io:
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
7. Install Pip:
8. Verify Pip version:
pip3 --version pip 19.3.1 from /usr/local/lib/python3.7/site-packages/pip (python 3.7)
9. Install CSE:
pip3 install container-service-extension
10. Login to your vCloud instance with an system administrator account. When the logon action completed succesfully, you will be getting the following output: username logged in, org: ‘System’, vdc: ”.
vcd login vcddomain.com system username
10. Let’s verify the version of CSE by running the following command:
vcd cse version Error: No such command "cse".
In the example above, there is an error that indicate the unknown command. The error is basically telling us that the CSE extension isn’t working correctly. To fix this, we need to add two lines of code in the profiles.yaml file that has been located in ~/.vcd-cli/. The profiles.yaml file is available, after loggin in to vCD with vcd-cli. Place the two lines of code between the active and profiles section as shown below:
extensions: - container_service_extension.client.cse
Try the same command again and it should work.
vcd cse version CSE, Container Service Extension for VMware vCloud Director, version 2.5.1
Creating CSE config file
1. To create a config.yaml sample file, run the following command:
cse sample -o config.yaml
In the sample config file, there are 5 mandatory sections with information about the AMQP server, vCD server, vCenter server and orgVDC settings.
Example config.yaml file:
amqp: exchange: cse-ext host: amqp.vmware.com password: guest port: 5672 prefix: vcd routing_key: cse ssl: false ssl_accept_all: false username: guest vhost: / vcd: api_version: '33.0' host: vcd.vmware.com log: true password: my_secret_password port: 443 username: administrator verify: true vcs: - name: vc1 password: my_secret_password username: email@example.com verify: true - name: vc2 password: my_secret_password username: firstname.lastname@example.org verify: true service: enforce_authorization: false listeners: 5 log_wire: false broker: catalog: cse default_template_name: my_template default_template_revision: 0 ip_allocation_mode: pool network: mynetwork org: myorg remote_template_cookbook_url: https://raw.githubusercontent.com/vmware/container-service-extension-templates/master/template.yaml storage_profile: '*' vdc: myorgvdc # [Optional] Template rule section # Rules can be defined to override template definitions as defined by remote # template cookbook. # Any rule defined in this section can match exactly one template. # Template name and revision must be provided for the rule to be processed. # Templates will still have the default attributes that were defined during template creation. # These newly defined attributes only affect new cluster deployments from templates. # Template rules can override the following attributes: # * compute_policy # * cpu # * memory # Example 'template_rules' section: #template_rules: #- name: Rule1 # target: # name: photon-v2_k8-1.12_weave-2.3.0 # revision: 1 # action: # compute_policy: "sample policy" # cpu: 4 # mem: 512 #- name: Rule2 # target: # name: my_template # revision: 2 # action: # cpu: 2 # mem: 1024
Installing CSE server with config.yaml
1. A valid public SSH key is required, to install the CSE software. If you do not have an SSH key yet, run this command to create one: ssh-keygen -t rsa -b 4096 -C “email@example.com”.
Perform the CSE installation with the config.yaml file as shown below:
cse install -c config.yaml --ssh-key ~/.ssh/id_rsa.pub
There will be several checks performed, like testing connectivity with the configured AMQP server, vCenter server, vCD instance and OrgvDC. The installation will fail, if one of the checks failed. In the configured AMQP server, a new exchange will be created to handle the messaging for CSE. The CSE Kubernetes templates will be downloaded from GitHub and customized.
2. Validating the installation state of the CSE server:
cse check --config config.yaml --check-install Required Python version: >= 3.7.3 Installed Python version: 3.7.4 (default, Nov 28 2019, 14:19:58) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] Validating config file 'config.yaml' Connected to AMQP server (amqp.yourdomain.local:5672) Connected to vCloud Director (vclouddomain.com:443) Connected to vCenter Server 'vca01.yourdomain.local' as 'firstname.lastname@example.org' (vca01.yourdomain.local:443) Config file 'config.yaml' is valid Validating CSE installation according to config file AMQP exchange 'cse-ext' exists CSE on vCD is currently enabled Found catalog 'cse' CSE installation is valid
3. Validating the config.yaml file:
cse check --config config.yaml Required Python version: >= 3.7.3 Installed Python version: 3.7.4 (default, Nov 28 2019, 14:19:58) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] Validating config file 'config.yaml' Connected to AMQP server (amqp.yourdomain.local:5672) Connected to vCloud Director (vclouddomain.com:443) Connected to vCenter Server 'vc01.yourdomain.local' as 'email@example.com' (vc01.yourdomain.local:443) Config file 'config.yaml' is valid
Configure CSE services
To start the CSE service on the CSE server, we need to run the cse run command with the required config.yaml file.
cse run --config config.yaml
If you would like to start the service in the background:
nohup cse run --config config.yaml > nohup.out 2>&1 &
Ideally, we would like to control the CSE service with systemctl. To set this up
Create a new file called cse.sh, that contains the cse run command.
Copy and paste the config as shown below:
cse run --config /home/cse/config.yaml
Create a new file called cse.service in the directory /etc/systemd/system/.
We will now add the information like: ExecStart, User and WorkingDirectory as shown below. You need to make sure, that you are running the service with the correct service account and that you are pointing to the correct path of the cse.sh start script and working directory.
[Service] ExecStart=/bin/sh /home/cse/cse.sh Type=simple User=cse WorkingDirectory=/home/cse Restart=always [Install] WantedBy=multi-user.target
Let’s reload the systemctl config:
Systemctl is now able to interact with the CSE service, as shown below
systemctl start cse systemctl restart cse systemctl stop cse
Enabling the AutoStart of the CSE service after an reboot:
systemctl enable cse
We now have successfully deployed CSE into vCloud Director. In the upcoming blog posts, I will be posting an follow up to show the deployment of an Kubernetes cluster with CSE in vCD.