Running on Kubernetes

Follow the steps given below to run a WSO2 product as a service on Private PaaS, on Kubernetes:

Step 1: Deploying Private PaaS on a preferred IaaS

For more information on deploying Private PaaS, see deploying PPaaS on a Preferred IaaS.

Step 2: Downloading the Product pack

Download the required product pack from the respective product download page.

Example: Download ESB from here.
Copy the downloaded .zip file to the packs folder, which is in the /etc/puppet/modules/wso2installer/files/<SERVER_NAME> directory.
Example: When configuring ESB copy the file to the /etc/puppet/modules/wso2installer/files/wso2esb481/packs directory.

Step 3: Importing the Docker image to the nodes

Download the Private PaaS cartridges from the product page.
Navigate to the <PRIVATE-PAAS-CARTRIDGES>/wso2esb/4.8.1/docker directory.
```
cd <PRIVATE-PAAS-CARTRIDGES>/wso2esb/4.8.1/docker
```
Run the build.sh file to build the Docker image.

This will copy the plugins and the template module to the Docker image.
```
./build.sh
```
List the Docker images.
```
docker images
```
Example response format: If you have successfully build the Docker image, you will get the following as the response:
```
wso2/das        3.0.0              ac57800e96c2        2 minutes ago         777.6 MB
```

Save the new image to a .tar file.

docker save <NEW_IMAGE_NAME> > <LOCATION_OF_OF_TAR_FILE>

For example:

docker save myppaasimage > /tmp/myppaasimage.tar

Copy the Docker image to the Kubernetes minion nodes.
```
scp <IMAGE_NAME>.tar core@<NODE_IP>:
```
Example:
```
scp myppaasimage.tar core@172.17.8.102:
```
Execute the kubectl get nodes command to get the IP address of the Kubernetes nodes.
SSH into the Kubernetes node using one of the following commands:
```
ssh core@<NODE_IP> or vagrant ssh node-01
```

Load the .tar file to the Kubernetes node.

docker load < <LOCATION_OF_OF_TAR_FILE>

Example:

docker load < /tmp/myppaasimage.tar

If there is more than one Kubernetes node, repeat step 4, 5 and 6 for the remaining nodes.

Step 4: Creating Database tables (optional)

This step is not mandatory. To confirm if the product you are running on top of WSO2 Private PaaS requires a database table, refer the README file of the specific product or cartridge folder.

Create the a database (or databases depending on the requirement) using the following commands, where <PRODUCT_HOME> is the path to any of the product instances you installed, and specify the username and password.

About using MySQL in different operating systems

For users of Microsoft Windows, when creating the database in MySQL, it is important to specify the character set as latin1. Failure to do this may result in an error (error code: 1709) when starting your cluster. This error occurs in certain versions of MySQL (5.6.x) and is related to the UTF-8 encoding. MySQL originally used the latin1 character set by default, which stored characters in a 2-byte sequence. However, in recent versions, MySQL defaults to UTF-8 to be friendlier to international users. Hence, you must use latin1 as the character set as indicated below in the database creation commands to avoid this problem. Note that this may result in issues with non-latin characters (like Hebrew, Japanese, etc.). The following is how your database creation command should look.

mysql> create database <DATABASE_NAME> character set latin1;

For users of other operating systems, the standard database creation commands will suffice. For these operating systems, the following is how your database creation command should look.

mysql> create database <DATABASE_NAME>;

Example: You will need to create 3 databases for API Manager as shown below

mysql> create database apimgtdb;
mysql> use apimgtdb;
mysql> source <APIM_HOME>/dbscripts/apimgt/mysql.sql;
mysql> grant all on apimgtdb.* TO username@localhost identified by "password";
 
 
mysql> create database userdb;
mysql> use userdb;
mysql> source <APIM_HOME>/dbscripts/mysql.sql;
mysql> grant all on userdb.* TO username@localhost identified by "password";
 
 
mysql> create database regdb;
mysql> use regdb;
mysql> source <APIM_HOME>/dbscripts/mysql.sql;
mysql> grant all on regdb.* TO username@localhost identified by "password";

Ensure that MySQL is configured so that all nodes can connect to it.

Step 5: Configuring the artifact JSON files

Cartridge JSON
Configure the following parameters in the cartridge JSON file:
- Ensure that the imageId under the iaasProvider is the same as the Docker image you created, If you are running Private PaaS on Kubernetes.

Update the datasource configurations, i.e DB URLs, username and password, under properties.

Update datasource configurations for all cartridge JSON files that run on all IaaS, except the Mock IaaS.

Datasource configurations

{
  "name": "payload_parameter.CONFIG_PARAM_REGISTRY_DB_URL",
  "value": "jdbc:mysql://192.168.30.7:3306/stratos_reg_db?autoReconnect=true"
},
{
  "name": "payload_parameter.CONFIG_PARAM_REGISTRY_DB_USER_NAME",
  "value": "<USER_NAME>"
},
{
  "name": "payload_parameter.CONFIG_PARAM_REGISTRY_DB_PASSWORD",
  "value": "<PASSWORD>"
},
{
  "name": "payload_parameter.CONFIG_PARAM_CONFIG_DB_URL",
  "value": "jdbc:mysql://192.168.30.7:3306/config_db_esb?autoReconnect=true"
},
{
  "name": "payload_parameter.CONFIG_PARAM_CONFIG_DB_USER_NAME",
  "value": "<USER_NAME>"
},
{
  "name": "payload_parameter.CONFIG_PARAM_CONFIG_DB_PASSWORD",
  "value": "<PASSWORD>"
},
{
  "name": "payload_parameter.CONFIG_PARAM_USER_MGT_DB_URL",
  "value": "jdbc:mysql://192.168.30.7:3306/stratos_user_db?autoReconnect=true"
},
{
  "name": "payload_parameter.CONFIG_PARAM_USER_MGT_DB_USER_NAME",
  "value": "<USER_NAME>"
},
{
  "name": "payload_parameter.CONFIG_PARAM_USER_MGT_DB_PASSWORD",
  "value": "<PASSWORD>"
}

Example:

{
  "name": "payload_parameter.CONFIG_PARAM_REGISTRY_DB_URL",
  "value": "jdbc:mysql://192.168.30.7:3306/stratos_reg_db?autoReconnect=true"
},
{
  "name": "payload_parameter.CONFIG_PARAM_REGISTRY_DB_USER_NAME",
  "value": "root"
},
{
  "name": "payload_parameter.CONFIG_PARAM_REGISTRY_DB_PASSWORD",
  "value": "root"
},
{
  "name": "payload_parameter.CONFIG_PARAM_CONFIG_DB_URL",
  "value": "jdbc:mysql://192.168.30.7:3306/config_db_esb?autoReconnect=true"
},
{
  "name": "payload_parameter.CONFIG_PARAM_CONFIG_DB_USER_NAME",
  "value": "root"
},
{
  "name": "payload_parameter.CONFIG_PARAM_CONFIG_DB_PASSWORD",
  "value": "root"
},
{
  "name": "payload_parameter.CONFIG_PARAM_USER_MGT_DB_URL",
  "value": "jdbc:mysql://192.168.30.7:3306/stratos_user_db?autoReconnect=true"
},
{
  "name": "payload_parameter.CONFIG_PARAM_USER_MGT_DB_USER_NAME",
  "value": "root"
},
{
  "name": "payload_parameter.CONFIG_PARAM_USER_MGT_DB_PASSWORD",
  "value": "root"
}

Network Partition JSON
Configuring the network partition is optional. Define the load balancer port IPs under property.

Application JSON
If the application is a single tenant application, ensure to add the artifact repository related details in subscribableInfo, under the artifactRepository section, of the application JSON definition.
Example:
```
"artifactRepository":{  
   "privateRepo":false,
   "repoUrl":"https://github.com/lakwarus/single-cartridge.git",
   "repoUsername":"",
   "repoPassword":""
}
```
By subscribing to an application you can deploy a custom application artifacts in Private PaaS.

Application Sign Up JSON
Sign up to the application if the application is a multi-tenant application.

For more information on application sign up see, signing up to an application.

Step 6: Running the product as a service on Private PaaS

Navigate to the application directory of the preferred WSO2 product.

cd <PRIVATE_PAAS_CARTRIDGES_HOME>/<SERVER_NAME>/<VERSION>/samples/applications/<SERVER_NAME>-<VERSION>-application/scripts/<IAAS>

Example:

cd <PRIVATE_PAAS_CARTRIDGES_HOME>/wso2das/3.0.0/samples/applications/wso2das-300-application/scripts/mock

Deploy the application.
```
./deploy.sh
```