# Deployment on Google Cloud
## Common Procedure
1. Create an account on Google Cloud (with $300 free credits) and enable billing.
2. Create a VM instance from Compute Engine.
3. SSH to the terminal from the browser of the new VM.
4. Install Docker and Docker Compose in the VM.
## For Judge0
5. Download and extract Judge0 source codes.
6. Run docker-compose commands.
7. Set Firewall rules in under VPC network.
## For Main App
1. Check if git is installed.
2. Refer to [README](https://github.com/creativehope-inc/afg).
3. Set Firewall rule to 8000 (similar to procedure #7).
## Common Procedure
### 1. Create an account on Google Cloud (with $300 free credits) and enable billing.
- Get started for free: https://cloud.google.com/free/
### 2. Create a VM instance from Compute Engine.
#### 2.1. Navigate to Compute Engine > VM Instance
#### 2.2. Click "Enable":
#### 2.3. Name the instance and select default options:
#### 2.4. Check for firewall HTTP and HTTPS for incoming traffic and click "Create".
### 3. SSH to the terminal from the browser of the new VM.
#### 3.1. Once ready, connect to the instance:
### 4. Install Docker and Docker Compose in the VM.
#### 4.1 Set up the repository.
##### 4.1.1. Update the apt package index and install packages to allow apt to use a repository over HTTPS:
```
sudo apt-get update
sudo apt-get install \
ca-certificates \
curl \
gnupg \
lsb-release
```
##### 4.1.2. Add Docker’s official GPG key:
```
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
```
##### 4.1.3. Use the following command to set up the **stable** repository. To add the **nightly** or **test** repository, add the word `nightly` or `test` (or both) after the word `stable` in the commands below:
```
echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \
$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
```
#### 4.2. Install Docker Engine
This procedure works for Debian on `x86_64` / `amd64`, `armhf`, `arm64`, and Raspbian.
##### 4.2.1. Update the apt package index, and install the latest version of Docker Engine and containerd, or go to the next step to install a specific version:
```
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io
```
##### 4.2.2. Verify that Docker Engine is installed correctly by running the hello-world image.
```
sudo docker run hello-world
```
#### 4.3. Install Docker Compose (for Linux systems)
##### 4.3.1. Run this command to download the current stable release of Docker Compose:
```
sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
```
##### 4.3.2. Apply executable permissions to the binary:
```
sudo chmod +x /usr/local/bin/docker-compose
```
**Note:** If the command docker-compose fails after installation, check your path. You can also create a symbolic link to /usr/bin or any other directory in your path.
```
sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
```
##### 4.3.3. Test the installation:
```
docker-compose --version
```
#### 4.4. Configure Docker to start on boot
Most current Linux distributions (RHEL, CentOS, Fedora, Debian, Ubuntu 16.04 and higher) use `systemd` to manage which services start when the system boots. On Debian and Ubuntu, the Docker service is configured to start on boot by default. To automatically start Docker and Containerd on boot for other distros, use the commands below:
```
sudo systemctl enable docker.service
sudo systemctl enable containerd.service
```
## For Judge0
### 5. Download and extract Judge0 source codes.
#### 5.1. Install wget and unzip:
```
sudo apt install wget
sudo apt install unzip
```
#### 5.2. Download and extract.
```
wget https://github.com/judge0/judge0/releases/download/v1.13.0/judge0-v1.13.0.zip && unzip judge0-v1.13.0.zip
```
### 6. Run docker-compose commands.
```
cd judge0-v1.13.0
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```
### 7. Set Firewall rules in under VPC network.
#### 7.1 On the sidebar navigate to Networking > VPC network > Firewall:
#### 7.2 At the top, click "Create Firewall Rule":
#### 7.3 Fill out accordingly and click "Create":
#### References:
- https://medium.com/javarevisited/lets-deploy-our-online-code-executor-in-google-cloud-e76a9fabac57
- https://cloud.google.com/vpc/docs/using-firewalls#listing-firewall-rules-vpc
- https://avinetworks.com/docs/21.1/gcp-firewall-rules/
- https://ce.judge0.com/#submissions-submission-post
- https://docs.docker.com/engine/install/linux-postinstall/
- https://docs.docker.com/engine/install/debian/
- https://docs.docker.com/compose/install/
- https://www.cyberciti.biz/faq/how-to-install-wget-togetrid-of-error-bash-wget-command-not-found/
- https://www.tecmint.com/install-zip-and-unzip-in-linux/
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