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Mike Conrad
2025-04-30 19:23:10 -04:00
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## Containers are just processes ## Containers are just processes
If you don't take anything else away from this talk, I hope you walk away with a better understanding of this fundamental. As far as the OS is concerned, a container is just another process/set of processes to the operating system. If you don't take anything else away from this talk, I hope you walk away with a better understanding of this fundamental. As far as the OS* is concerned, a container is just another process/set of processes to the operating system.
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<p style="font-size:10px;max-width:20vw;line-height:1.3em;">*This is only strictly true on Linux. Running Docker on Mac/Windows requires Docker Desktop which actually creates and manages a Linux VM. Your containers actually run inside of this VM.</p>
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transition: fade-out
layout: two-cols-header
---
# Let's get started
::left::
## Windows/Mac
Install Docker Desktop from: https://docs.docker.com/desktop/
::right::
## Linux
Find installation instructions for Docker Engine here: https://docs.docker.com/engine/install/ubuntu/
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---
# Running our first container
## First run the container
We are running an nginx webserver container in daemon (background mode). We are forwarding connections from localhost:8088 to port 80 *inside* the container. This is the default port that nginx is running on.
````md magic-move
```shell
$ docker run --rm -p 8088:80 --name nginx-container -d nginx:alpine
```
```shell
$ docker run --rm -p 8088:80 --name nginx-container -d nginx:alpine
cd4302edce965beb95fdb9ecb19ff7432758f1e505d792e368fd401ea9abab65
```
```shell
$ docker container ps
```
```shell
$ docker container ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cd4302edce96 nginx:alpine "/docker-entrypoint.…" 15 seconds ago Up 14 seconds 0.0.0.0:8088->80/tcp, [::]:8088->80/tcp nginx-container
```
````
# Now run docker container ps to list running containers
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--- ---
## View the logs for our container
````md magic-move
```shell
$ docker container logs --follow nginx-container
```
```shell
$ docker container logs --follow nginx-container
/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
2025/04/30 23:02:32 [notice] 1#1: using the "epoll" event method
2025/04/30 23:02:32 [notice] 1#1: nginx/1.27.5
2025/04/30 23:02:32 [notice] 1#1: built by gcc 14.2.0 (Alpine 14.2.0)
2025/04/30 23:02:32 [notice] 1#1: OS: Linux 6.12.10-76061203-generic
2025/04/30 23:02:32 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1024:524288
2025/04/30 23:02:32 [notice] 1#1: start worker processes
2025/04/30 23:02:32 [notice] 1#1: start worker process 30
2025/04/30 23:02:32 [notice] 1#1: start worker process 31
2025/04/30 23:02:32 [notice] 1#1: start worker process 32
2025/04/30 23:02:32 [notice] 1#1: start worker process 33
2025/04/30 23:02:32 [notice] 1#1: start worker process 34
2025/04/30 23:02:32 [notice] 1#1: start worker process 35
2025/04/30 23:02:32 [notice] 1#1: start worker process 36
2025/04/30 23:02:32 [notice] 1#1: start worker process 37
```
````
---
transition: fade-out
---
## Interacting with our container
Now let's try interacting with the Nginx server. By default it should serve a default page.
````md magic-move
```shell
# Hitting Ctrl+Z on Linux will put our logs process into the background
$ ^Z
```
```shell
$ ^Z
[1]+ Stopped docker container logs --follow nginx-container
```
```shell
# Now send a curl request to localhost:8080. This should be forwarded to port 80 in our container
$ curl localhost:8088
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
```
````