Voici mon erreur :

$ sudo docker-compose up -d
Pulling db (library/mariadb:10.0.23)...
ERROR: Get https://registry-1.docker.io/v2/: x509: certificate signed by unknown authority

Pour fixer le problème, j’ai fait :

$ sudo update-ca-certificates --fresh
...
$ openssl s_client -showcerts -verify 5 -connect registry-1.docker.io:443 < /dev/null 2>/dev/null | openssl x509 -outform PEM | tee ~/docker.crt
...
$ openssl s_client -showcerts -verify 5 -connect production.cloudflare.docker.com:443 < /dev/null 2>/dev/null | openssl x509 -outform PEM | tee ~/docker-com.crt
...
$ sudo cp ~/docker-com.crt /usr/local/share/ca-certificates/.
...
$ sudo cp ~/docker.crt /usr/local/share/ca-certificates/
...
$ sudo update-ca-certificates
...
$ sudo service docker restart

Ensuite cela a fixé mon problème … provisoirement :

$ docker-compose up -d
Pulling db (library/mariadb:10.0.23)...
10.0.23: Pulling from library/mariadb
7268d8f794c4: Downloading
a3ed95caeb02: Downloading
e5a99361f38c: Downloading
20b20853e29d: Downloading
9dbc63cf121f: Downloading
fdebb5c64c6c: Downloading
38152cd1ae2a: Downloading
d7f1267eb179: Downloading
cb5b075a9692: Downloading
d65a44f4573e: Downloading
ERROR: x509: certificate signed by unknown authority