In this course I have learned what is Docker and how to use it to create Images, Containers...
Let's run our first PostgreSQL docker image.
$ docker run postgres
Unable to find image 'postgres:latest' locally
latest: Pulling from library/postgres
8740c948ffd4: Pull complete
c8dbd2beab50: Pull complete
05d9dc9d0fbd: Pull complete
ddd89d5ec714: Pull complete
f98bb9f03867: Pull complete
0554611e703f: Pull complete
64e0a8694477: Pull complete
8b868a753f47: Pull complete
12ed9aefbab3: Pull complete
825b08d51ffd: Pull complete
8f272b487267: Pull complete
ba2eed7bd2cc: Pull complete
ff59f63f47d6: Pull complete
Digest: sha256:6b07fc4fbcf551ea4546093e90cecefc9dc60d7ea8c56a4ace704940b6d6b7a3
Status: Downloaded newer image for postgres:latest
Error: Database is uninitialized and superuser password is not specified.
You must specify POSTGRES_PASSWORD to a non-empty value for the
superuser. For example, "-e POSTGRES_PASSWORD=password" on "docker run".
You may also use "POSTGRES_HOST_AUTH_METHOD=trust" to allow all
connections without a password. This is *not* recommended.
See PostgreSQL documentation about "trust":
https://www.postgresql.org/docs/current/auth-trust.html
Here we will see an error because we didn't define the necessary environment variables, so let's try again.
$ docker run -d -e POSTGRES_PASSWORD=password postgres
4be3f2d931c5753e2eaf3e9eee87e6b1223253fa47a29140632a1b84e85a42ee
Now we can list the images we have in our system and the containers running.
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
postgres latest 9f3ec01f884d 5 days ago 379MB
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4be3f2d931c5 postgres "docker-entrypoint.s…" About a minute ago Up About a minute 5432/tcp competent_lichterman
Now, we can delete a container. First, list all the container, -a to list stopped too.
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
28fd4365c7bd postgres:bullseye "docker-entrypoint.s…" 4 minutes ago Up 4 minutes 5432/tcp naughty_mendel
4be3f2d931c5 postgres "docker-entrypoint.s…" 22 hours ago Exited (255) 14 minutes ago 5432/tcp competent_lichterman
9b597e6fa7e9 postgres "docker-entrypoint.s…" 22 hours ago Exited (0) 22 hours ago loving_satoshi
49375fa7026d postgres "docker-entrypoint.s…" 22 hours ago Exited (1) 22 hours ago kind_hopper
$ docker rm 49375fa7026d
49375fa7026d
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
28fd4365c7bd postgres:bullseye "docker-entrypoint.s…" 4 minutes ago Up 4 minutes 5432/tcp naughty_mendel
4be3f2d931c5 postgres "docker-entrypoint.s…" 22 hours ago Exited (255) 14 minutes ago 5432/tcp competent_lichterman
9b597e6fa7e9 postgres "docker-entrypoint.s…" 22 hours ago Exited (0) 22 hours ago loving_satoshi
We can force to delete a container that is running.
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
28fd4365c7bd postgres:bullseye "docker-entrypoint.s…" 7 minutes ago Up 7 minutes 5432/tcp naughty_mendel
4be3f2d931c5 postgres "docker-entrypoint.s…" 22 hours ago Exited (255) 17 minutes ago 5432/tcp competent_lichterman
9b597e6fa7e9 postgres "docker-entrypoint.s…" 22 hours ago Exited (0) 22 hours ago loving_satoshi
$ docker rm -f 28fd4365c7bd
28fd4365c7bd
Let's delete an image. At the beginning we can't delete the image because is being used, so we have to force de deletion using -f.
$ docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
postgres bullseye 9f3ec01f884d 6 days ago 379MB
postgres latest 9f3ec01f884d 6 days ago 379MB
$ docker image rm 9f3ec01f884d
Error response from daemon: conflict: unable to delete 9f3ec01f884d (must be forced) - image is referenced in multiple repositories
$ docker image rm -f 9f3ec01f884d
Untagged: postgres:bullseye
Untagged: postgres:latest
Untagged: postgres@sha256:6b07fc4fbcf551ea4546093e90cecefc9dc60d7ea8c56a4ace704940b6d6b7a3
Deleted: sha256:9f3ec01f884db0c4e6b637c730043ad1ac9dcaa684e8fa5b858ddf72a3848ddf
We can pull images like Ubuntu.
$ docker pull ubuntu
Using default tag: latest
latest: Pulling from library/ubuntu
6e3729cf69e0: Pull complete
Digest: sha256:27cb6e6ccef575a4698b66f5de06c7ecd61589132d5a91d098f7f3f9285415a9
Status: Downloaded newer image for ubuntu:latest
docker.io/library/ubuntu:latest
$ docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu latest 6b7dfa7e8fdb 5 weeks ago 77.8MB
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
Then, we can run it with a custom tag (name):
$ docker run --name my_ubuntu ubuntu
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e85025da209f ubuntu "bash" 16 seconds ago Exited (0) 16 seconds ago my_ubuntu
Using the postgres container, we can execute commands inside the container. In this case, we are going to create an interactive shell.
$ docker run -d -e POSTGRES_PASSWORD=password postgres
Unable to find image 'postgres:latest' locally
latest: Pulling from library/postgres
8740c948ffd4: Already exists
c8dbd2beab50: Pull complete
05d9dc9d0fbd: Pull complete
ddd89d5ec714: Pull complete
f98bb9f03867: Pull complete
0554611e703f: Pull complete
64e0a8694477: Pull complete
8b868a753f47: Pull complete
12ed9aefbab3: Pull complete
825b08d51ffd: Pull complete
8f272b487267: Pull complete
ba2eed7bd2cc: Pull complete
ff59f63f47d6: Pull complete
Digest: sha256:6b07fc4fbcf551ea4546093e90cecefc9dc60d7ea8c56a4ace704940b6d6b7a3
Status: Downloaded newer image for postgres:latest
36804401c2cd7014bcf811b01fd6dd7d43f563bab7e6431ffaec95f0653ae98f
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
36804401c2cd postgres "docker-entrypoint.s…" 23 seconds ago Up 20 seconds 5432/tcp eager_merkle
$ docker exec -it 36804401c2cd sh
# ls
bin dev etc lib media opt root sbin sys usr
boot docker-entrypoint-initdb.d home lib64 mnt proc run srv tmp var
# whoami
root
Finally, we can see the logs of a container.
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
36804401c2cd postgres "docker-entrypoint.s…" About an hour ago Up About an hour 5432/tcp eager_merkle
7c47832e8aa4 redis "docker-entrypoint.s…" 2 hours ago Up 2 hours 6379/tcp epic_johnson
$ docker logs 36804401c2cd
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.
The database cluster will be initialized with locale "en_US.utf8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".
Data page checksums are disabled.
fixing permissions on existing directory /var/lib/postgresql/data ... ok
creating subdirectories ... ok
selecting dynamic shared memory implementation ... posix
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting default time zone ... Etc/UTC
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... ok
syncing data to disk ... ok
Success. You can now start the database server using:
pg_ctl -D /var/lib/postgresql/data -l logfile start
initdb: warning: enabling "trust" authentication for local connections
initdb: hint: You can change this by editing pg_hba.conf or using the option -A, or --auth-local and --auth-host, the next time you run initdb.
waiting for server to start....2023-01-17 16:19:39.455 UTC [48] LOG: starting PostgreSQL 15.1 (Debian 15.1-1.pgdg110+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 10.2.1-6) 10.2.1 20210110, 64-bit
2023-01-17 16:19:39.461 UTC [48] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2023-01-17 16:19:39.474 UTC [51] LOG: database system was shut down at 2023-01-17 16:19:37 UTC
2023-01-17 16:19:39.481 UTC [48] LOG: database system is ready to accept connections
done
server started
/usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*
waiting for server to shut down...2023-01-17 16:19:39.564 UTC [48] LOG: received fast shutdown request
.2023-01-17 16:19:39.571 UTC [48] LOG: aborting any active transactions
2023-01-17 16:19:39.572 UTC [48] LOG: background worker "logical replication launcher" (PID 54) exited with exit code 1
2023-01-17 16:19:39.573 UTC [49] LOG: shutting down
2023-01-17 16:19:39.578 UTC [49] LOG: checkpoint starting: shutdown immediate
2023-01-17 16:19:39.613 UTC [49] LOG: checkpoint complete: wrote 3 buffers (0.0%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.011 s, sync=0.006 s, total=0.040 s; sync files=2, longest=0.003 s, average=0.003 s; distance=0 kB, estimate=0 kB
2023-01-17 16:19:39.616 UTC [48] LOG: database system is shut down
done
server stopped
PostgreSQL init process complete; ready for start up.
2023-01-17 16:19:39.687 UTC [1] LOG: starting PostgreSQL 15.1 (Debian 15.1-1.pgdg110+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 10.2.1-6) 10.2.1 20210110, 64-bit
2023-01-17 16:19:39.687 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
2023-01-17 16:19:39.687 UTC [1] LOG: listening on IPv6 address "::", port 5432
2023-01-17 16:19:39.698 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2023-01-17 16:19:39.709 UTC [62] LOG: database system was shut down at 2023-01-17 16:19:39 UTC
2023-01-17 16:19:39.716 UTC [1] LOG: database system is ready to accept connections
2023-01-17 16:24:39.808 UTC [60] LOG: checkpoint starting: time
2023-01-17 16:24:43.890 UTC [60] LOG: checkpoint complete: wrote 43 buffers (0.3%); 0 WAL file(s) added, 0 removed, 0 recycled; write=4.027 s, sync=0.030 s, total=4.082 s; sync files=11, longest=0.008 s, average=0.003 s; distance=252 kB, estimate=252 kB
For example, we can search for Ubuntu images.
$ docker search ubuntu
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
ubuntu Ubuntu is a Debian-based Linux operating sys… 15468 [OK]
websphere-liberty WebSphere Liberty multi-architecture images … 291 [OK]
ubuntu-upstart DEPRECATED, as is Upstart (find other proces… 111 [OK]
neurodebian NeuroDebian provides neuroscience research s… 98 [OK]
ubuntu/nginx Nginx, a high-performance reverse proxy & we… 75
open-liberty Open Liberty multi-architecture images based… 56 [OK]
ubuntu/apache2 Apache, a secure & extensible open-source HT… 52
ubuntu-debootstrap DEPRECATED; use "ubuntu" instead 50 [OK]
ubuntu/squid Squid is a caching proxy for the Web. Long-t… 49
ubuntu/bind9 BIND 9 is a very flexible, full-featured DNS… 43
ubuntu/mysql MySQL open source fast, stable, multi-thread… 41
ubuntu/prometheus Prometheus is a systems and service monitori… 35
ubuntu/postgres PostgreSQL is an open source object-relation… 23
ubuntu/kafka Apache Kafka, a distributed event streaming … 20
ubuntu/redis Redis, an open source key-value store. Long-… 16
ubuntu/prometheus-alertmanager Alertmanager handles client alerts from Prom… 8
ubuntu/dotnet-deps Chiselled Ubuntu for self-contained .NET & A… 6
ubuntu/grafana Grafana, a feature rich metrics dashboard & … 6
ubuntu/memcached Memcached, in-memory keyvalue store for smal… 5
ubuntu/zookeeper ZooKeeper maintains configuration informatio… 5
ubuntu/dotnet-runtime Chiselled Ubuntu runtime image for .NET apps… 5
ubuntu/telegraf Telegraf collects, processes, aggregates & w… 4
ubuntu/cortex Cortex provides storage for Prometheus. Long… 3
ubuntu/dotnet-aspnet Chiselled Ubuntu runtime image for ASP.NET a… 3
ubuntu/cassandra Cassandra, an open source NoSQL distributed … 2
What if we want to change the name of a container?
$ docker run redis -d
*** FATAL CONFIG FILE ERROR (Redis 7.0.7) ***
Reading the configuration file, at line 2
>>> '"-d"'
Bad directive or wrong number of arguments
$ docker run -d redis
f34762910e01234d8b3293b274ce975d6e63fdb7d2799d339958d7850cad53ae
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f34762910e01 redis "docker-entrypoint.s…" 4 seconds ago Up 3 seconds 6379/tcp relaxed_diffie
$ docker rename f34762910e01 new_redis_container
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f34762910e01 redis "docker-entrypoint.s…" 24 seconds ago Up 23 seconds 6379/tcp new_redis_container
Let's export an image.
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
redis latest 5f2e708d56aa 7 days ago 117MB
postgres latest 9f3ec01f884d 7 days ago 379MB
ubuntu latest 6b7dfa7e8fdb 5 weeks ago 77.8MB
~
$ docker save ubuntu:latest | gzip > myubuntu.tar.gz
$ ls -l
.rw-r--r-- 30M raul 17 Jan 19:57 myubuntu.tar.gz
Then, we can import an image we have exported previously.
$ docker load < myubuntu.tar.gz
Loaded image: ubuntu:latest
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
redis latest 5f2e708d56aa 7 days ago 117MB
postgres latest 9f3ec01f884d 7 days ago 379MB
ubuntu latest 6b7dfa7e8fdb 5 weeks ago 77.8MB
Finally, we can see the performance in live stream of the containers.
$ docker stats
CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS
f34762910e01 new_redis_container 0.10% 7.758MiB / 7.616GiB 0.10% 1.23kB / 0B 0B / 0B 5
Building an image of my app.
$ docker build -t my_app .
[+] Building 128.6s (10/10) FINISHED
=> [internal] load build definition from Dockerfile 0.1s
=> => transferring dockerfile: 160B 0.0s
=> [internal] load .dockerignore 0.1s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/library/node:12.22.1-alpine3.11 43.9s
=> [auth] library/node:pull token for registry-1.docker.io 0.0s
=> [1/4] FROM docker.io/library/node:12.22.1-alpine3.11@sha256:93b71facf11d471ac035acfaf020ecc05297f6a401781caf 63.5s
=> => resolve docker.io/library/node:12.22.1-alpine3.11@sha256:93b71facf11d471ac035acfaf020ecc05297f6a401781cafc 0.1s
=> => sha256:93b71facf11d471ac035acfaf020ecc05297f6a401781cafceae1d0561704ba4 1.43kB / 1.43kB 0.0s
=> => sha256:5b8504e22687f25e22254d062558aa18d41d3331b64e771a6a0675e93d357e70 1.16kB / 1.16kB 0.0s
=> => sha256:ba59ff60c386d2dc77f7afc5f9211e410ce80e864415c1bafe0006ef76fece1c 6.53kB / 6.53kB 0.0s
=> => sha256:ddad3d7c1e96adf9153f8921a7c9790f880a390163df453be1566e9ef0d546e0 2.82MB / 2.82MB 9.3s
=> => sha256:8a6a62f4b1f37fb03e07275438ef8fd27a421cd1b0790e57f7dbab0c6328f811 24.60MB / 24.60MB 62.2s
=> => sha256:5c72c204eb2261d221bcc8b34dbb4727d6a6625dc7dadf87425c3fa8fd8bbf36 2.24MB / 2.24MB 5.9s
=> => sha256:33fce3bc6102e63645ad9b969467728efd17b0cdf8b083b1f505df5af73bd627 281B / 281B 6.4s
=> => extracting sha256:ddad3d7c1e96adf9153f8921a7c9790f880a390163df453be1566e9ef0d546e0 0.1s
=> => extracting sha256:8a6a62f4b1f37fb03e07275438ef8fd27a421cd1b0790e57f7dbab0c6328f811 0.7s
=> => extracting sha256:5c72c204eb2261d221bcc8b34dbb4727d6a6625dc7dadf87425c3fa8fd8bbf36 0.1s
=> => extracting sha256:33fce3bc6102e63645ad9b969467728efd17b0cdf8b083b1f505df5af73bd627 0.0s
=> [internal] load build context 0.5s
=> => transferring context: 4.62MB 0.4s
=> [2/4] WORKDIR /app 0.2s
=> [3/4] COPY . . 0.1s
=> [4/4] RUN yarn install --production 19.7s
=> exporting to image 0.9s
=> => exporting layers 0.9s
=> => writing image sha256:8cb0e8af41969e8474c68da6e8158be95a655d8a8225b9df7695752601b68ef8 0.0s
=> => naming to docker.io/library/my_app 0.0s
Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them
Once we have created the image, we can see it listed.
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
my_app latest 8cb0e8af4196 39 seconds ago 179MB
redis latest 5f2e708d56aa 10 days ago 117MB
postgres latest 9f3ec01f884d 10 days ago 379MB
ubuntu latest 6b7dfa7e8fdb 6 weeks ago 77.8MB
Now we can run a container of my image exposing the port 3000
$ docker run -dp 3000:3000 my_app
a0aeebe904dbc0f9a2b2924c6a043ffb86b0ef49d380254371779226a52c661b
We can check in the browser that is running on localhost:3000!
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a0aeebe904db my_app "docker-entrypoint.s…" 4 minutes ago Up 4 minutes 0.0.0.0:3000->3000/tcp quirky_booth
But if we want to make the data of my app persistent, we have to create a volume
$ docker volume create todo-db
todo-db
Then, we have to create a new container connected to my new volume.
$ docker run -dp 3000:3000 -v todo-db:/etc/todos my_app
c8e30553dd6af203317ca2e612dd8b4a6ed57b9e4f373a7c994827082f31824d
Finally, we can see the new container and the volumes created.
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c8e30553dd6a my_app "docker-entrypoint.s…" 10 seconds ago Up 9 seconds 0.0.0.0:3000->3000/tcp bold_lederberg
$ docker volume ls
DRIVER VOLUME NAME
local todo-db
What happens when we want to edit the app? In this case we are going to create another volume with the source code and create a new container with two volumes connected.
$ docker volume create source
source
$ docker run -dp 3000:3000 -v todo-db:/etc/todos -v source:/app/src my_app
6bd6b94b62cfa13b982ee9e1e6ac0b636a69b1def98a2df23e7a3b244ade3a44
Now we can edit our app in production! :D
Finally, we are going to upload the final image to Docker Hub. Let's build the image again.
$ docker build -t my_app:v2 .
[+] Building 44.5s (10/10) FINISHED
=> [internal] load build definition from Dockerfile 0.1s
=> => transferring dockerfile: 160B 0.0s
=> [internal] load .dockerignore 0.1s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/library/node:12.22.1-alpine3.11 43.7s
=> [auth] library/node:pull token for registry-1.docker.io 0.0s
=> [1/4] FROM docker.io/library/node:12.22.1-alpine3.11@sha256:93b71facf11d471ac035acfaf020ecc05297f6a401781cafc 0.0s
=> [internal] load build context 0.5s
=> => transferring context: 7.98kB 0.5s
=> CACHED [2/4] WORKDIR /app 0.0s
=> CACHED [3/4] COPY . . 0.0s
=> CACHED [4/4] RUN yarn install --production 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:8cb0e8af41969e8474c68da6e8158be95a655d8a8225b9df7695752601b68ef8 0.0s
=> => naming to docker.io/library/my_app:v2 0.0s
Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them
Let's list the images.
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
my_app v2 8cb0e8af4196 About an hour ago 179MB
redis latest 5f2e708d56aa 10 days ago 117MB
postgres latest 9f3ec01f884d 10 days ago 379MB
ubuntu latest 6b7dfa7e8fdb 6 weeks ago 77.8MB
Then, we have to create a tag to this version.
$ docker tag 8cb0e8af4196 raulsanchezzt/my_app:v2
$docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
my_app v2 8cb0e8af4196 About an hour ago 179MB
raulsanchezzt/my_app v2 8cb0e8af4196 About an hour ago 179MB
redis latest 5f2e708d56aa 10 days ago 117MB
postgres latest 9f3ec01f884d 10 days ago 379MB
ubuntu latest 6b7dfa7e8fdb 6 weeks ago 77.8MB
Finally, push the image to Docker Hub.
$ docker push raulsanchezzt/my_app:v2
The push refers to repository [docker.io/raulsanchezzt/my_app]
5e2c4a0714c1: Pushed
cd85639aa011: Pushed
fe3f4fe648a3: Pushed
de74bd1e76e0: Mounted from library/node
62ec5c862704: Mounted from library/node
0b9cfd251a3b: Mounted from library/node
9a5d14f9f550: Mounted from library/node
v2: digest: sha256:8bf76769926a66603019f526fe8c10c827c7c30963cc9ea32097fead8ac4e510 size: 1787
Now we are going to create two different containers: One for the app and the other to the database. We can do it using a long command but instead we are going to use Docker Compose. Let's create a new file named docker-compose.yaml in the multi-container directory to define the services we need in a single command.
$ cd multi-container/
$ ls
todo-app-mysql docker-compose.yml
$ docker compose up -d
[+] Running 2/0
⠿ Container multi-container-app-1 Running 0.0s
⠿ Container multi-container-db-1 Running
Then just execute the command to start the containers and it's done!.
Now, we are using ELK.
$ cd elk
docker compose up -d
[+] Running 4/4
⠿ Network elk_default Created 0.0s
⠿ Container elk-kibana-1 Started 1.1s
⠿ Container elk-logstash-1 Started 1.0s
⠿ Container elk-elasticsearch-1 Started 1.1s
Then, we can see the stats for this containers.
$ docker stats
CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS
84d8a426ed20 elk-logstash-1 6.57% 783.5MiB / 7.761GiB 9.86% 10.9kB / 30.1kB 0B / 0B 48
b09a570e28aa elk-elasticsearch-1 1.81% 1.424GiB / 7.761GiB 18.34% 11.4MB / 183kB 0B / 0B 78
a67c5e8aa232 elk-kibana-1 4.41% 672MiB / 7.761GiB 8.46% 175kB / 11.4MB 0B / 0B 12
Let's use cAdvisor now!
$ docker run -d \
--name cadvisor \
-p 8080:8080 \
google/cadvisor:latest
Unable to find image 'google/cadvisor:latest' locally
latest: Pulling from google/cadvisor
ff3a5c916c92: Pull complete
44a45bb65cdf: Downloading [================> ] 5.055MB/15.29MB
0bbe1a2fe2a6: Downloading [=============================> ] 7.8MB/13.17MB
Run the containers...
$ cd monitor/
$ docker compose up -d
[+] Running 5/5
⠿ Network monitor Created 0.0s
⠿ Container grafana Started 1.0s
⠿ Container prometheus Started 1.4s
⠿ Container redis Started 1.3s
⠿ Container redis-exporter Started 1.0s
Then, we can see the containers running...
$ docker compose ps
NAME COMMAND SERVICE STATUS PORTS
grafana "/run.sh" grafana running 0.0.0.0:3000->3000/tcp
prometheus "/bin/prometheus --c…" prometheus running 0.0.0.0:9090->9090/tcp
redis "docker-entrypoint.s…" redis running 0.0.0.0:6379->6379/tcp
redis-exporter "/redis_exporter" redis_exporter running 0.0.0.0:9121->9121/tcp
Finally, we can create a new data source in Grafana from Prometheus.