Lab02 SD-02 Timur Suleymanov

app_go/.dockerignore

@@ -0,0 +1,2 @@
+*.md
+*.png

app_go/DOCKER.md

@@ -0,0 +1,10 @@
+## 1. Best Practices
+
+1. Designating ENVironment variables via ENV
+2. Designating PORT via EXPORT
+3. Copying only essential files, not just "COPY . ."
+
+~~The rest points are in the precondition of the lab, but let's pretend we didn't know and implemented these best practices on our own~~
+
+4. Explicit version designation (base image, golang versions)
+5. User added to avoid root access

app_go/Dockerfile

@@ -0,0 +1,21 @@
+FROM golang:1.23.5-alpine3.21
+
+# Environment variables
+ENV ADMIN_USER="admin"
+
+# Copy static file directory
+COPY static ./static
+# Copy python app file
+COPY main.go ./
+
+# Setup an app user so the container doesn't run as the root user
+RUN adduser --system $ADMIN_USER
+USER $ADMIN_USER
+
+# Compile go application
+RUN go build -o randomizer main.go
+
+# Explicitly specify port
+EXPOSE 3000
+
+CMD ["./randomizer"]

app_go/README.md

@@ -38,3 +38,20 @@ When trying to get the result with conditions unsatisfied, the button will get r
 
 ![](images/image2.png)
 
+## Docker
+
+Building the image:
+```bash
+docker build -t your_image_name .
+```
+
+Pulling the image:
+```bash
+docker pull tjann7/go_random
+```
+
+Running the image locally ~~if you don't like parameters, good luck finding container's address~~:
+```bash
+docker run --network="host" go_random
+```
+

app_go/distroless.dockerfile

@@ -0,0 +1,37 @@
+# FROM golang:1.23.5 as build
+
+# # Environment variables
+# ENV ADMIN_USER="admin"
+
+# WORKDIR /go/src/app
+# COPY . .
+
+# RUN go mod download
+# RUN CGO_ENABLED=0 go build -o /go/bin/app
+
+# # The program will be compiled through this
+# FROM gcr.io/distroless/static:nonroot
+# COPY --from=build /go/bin/app .
+
+# # Explicitly specify port
+# EXPOSE 3000
+
+# CMD ["/app"]
+
+# In this image we build the binary
+FROM golang:1.23 AS build
+
+WORKDIR /go/src/app
+COPY . .
+
+RUN go mod download
+RUN CGO_ENABLED=1 go build -o /go/bin/app
+
+# Now copy it into our base image. 
+# We run code in it.
+FROM gcr.io/distroless/base-nossl:nonroot
+COPY --from=build /go/bin/app /
+
+EXPOSE 8080
+
+CMD ["/app"]

app_python/.dockerignore

@@ -0,0 +1,2 @@
+*.md
+*.png

app_python/DOCKER.md

@@ -0,0 +1,10 @@
+## 1. Best Practices
+
+1. Designating ENVironment variables via ENV
+2. Designating PORT via EXPORT
+3. Copying only essential files, not just "COPY . ."
+
+~~The rest points are in the precondition of the lab, but let's pretend we didn't know and implemented these best practices on our own~~
+
+4. Explicit version designation (base image, python versions)
+5. User added to avoid root access

app_python/Dockerfile

@@ -0,0 +1,22 @@
+FROM python:3.13.1-alpine3.21
+
+# Environment variables
+ENV ADMIN_USER="admin"
+
+# Install the application dependencies
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy static file directory
+COPY templates ./templates
+# Copy python app file
+COPY moscow_app.py ./
+
+# Setup an app user so the container doesn't run as the root user
+RUN adduser --system $ADMIN_USER
+USER $ADMIN_USER
+
+# Explicitly specify port
+EXPOSE 5000
+
+CMD ["python", "moscow_app.py"]

app_python/README.md

@@ -1,19 +1,19 @@
 ## Python Flask Moscow timezone Watch
 
-### Repository preparation
+## Repository preparation
 
 ```bash
 git clone https://github.com/tjann7/DevOps-Course.git
 cd DevOps-Course
 ```
 
-### Dependencies installation
+## Dependencies installation
 
 ```bash
 pip install -r requirements.txt
 ```
 
-### Starting the app
+## Starting the app
 In terminal of the project ('of the project' means being in the project directory) execute bash command:
 
         python .\app_python\moscow_app.py
@@ -27,3 +27,37 @@ Resulting webpage should look like this:
 
 ![alt text](./images/image1.png)
 
+## Docker
+
+Building the image:
+```bash
+docker build -t your_image_name .
+```
+
+Output should be similar to this:
+![](images/image_docker1.png)
+
+Pulling the image:
+```bash
+docker pull tjann7/moscow_time
+```
+
+Running the image locally ~~if you don't like parameters, good luck finding container's address~~:
+```bash
+docker run --network="host" moscow_time
+```
+
+Result of running is as follows:
+
+![](images/image_docker2.png)
+
+
+# ENDING
+
+To run distroless:
+
+```bash
+docker build -f distroless.dockerfile -t dless .
+docker run dless
+```
+