2019-11-03 17:54:22 +00:00
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Exercice : `docker exec`
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------------------------
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2017-11-09 00:30:41 +00:00
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Après voir lu la partie concernant les *namespaces*, vous avez dû comprendre
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qu'un `docker exec`, n'était donc rien de plus qu'un `nsenter(1)`.
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Réécrivons, en quelques lignes, la commande `docker exec` !
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Pour savoir si vous avez réussi, comparez les sorties des commandes :
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- `ip address` ;
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- `hostname` ;
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- `mount` ;
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- `pa -aux` ;
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- ...
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2019-11-03 17:54:22 +00:00
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### Tests {-}
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2017-11-09 00:30:41 +00:00
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<div lang="en-US">
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2018-11-16 01:38:41 +00:00
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```
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42sh$ docker run --name mywebserver -d -p 80:80 nginx
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d63ceae863956f8312aca60b7a57fbcc1fdf679ae4c90c5d9455405005d4980a
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42sh$ docker container inspect --format '{{ .State.Pid }}' mywebserver
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234269
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42sh# ./mydocker_exec mywebserver ip address
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1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
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link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
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2017-11-09 00:30:41 +00:00
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inet 127.0.0.1/8 scope host lo
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valid_lft forever preferred_lft forever
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2018-11-16 01:38:41 +00:00
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13: eth0@if14: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
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link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
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inet 172.17.0.1/16 scope global eth0
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valid_lft forever preferred_lft forever
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42sh# hostname
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koala.zoo.paris
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42sh# ./mydocker_exec mywebserver hostname
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d63ceae86395
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42sh# ./mydocker_exec mywebserver mount
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42sh# ./mydocker_exec mywebserver ps aux
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...
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2017-11-09 00:30:41 +00:00
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```
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</div>
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