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Rozmowa między kontenerowa może być zrealizowana na dwa sposoby. Pierwszy z nich to użycie adresów ip, jakie Docker nadaje każdemu kontenerowi. Do zademonstrowania działania posłużę się obrazem bazy danych mongo:
docker run -d --name mongodb mongo docker: error during connect: This error may indicate that the docker daemon is not running.: Post "http://%2F%2F.%2Fpipe%2Fdocker_engine/v1.24/containers/create?name=mongodb": open //./pipe/docker_engine: Nie można odnaleźć określonego pliku. See 'docker run --help'. Unable to find image 'mongo:latest' locally latest: Pulling from library/mongo d7bfe07ed847: Pull complete 97ef66a8492a: Pull complete 20cec14c8f9e: Pull complete 38c3018eb09a: Pull complete ccc9e1c2556b: Pull complete 593c62d03532: Pull complete 1a103a446c3f: Pull complete be887b845d3f: Pull complete e5543880b183: Pull complete Digest: sha256:37e84d3dd30cdfb5472ec42b8a6b4dc6ca7cacd91ebcfa0410a54528bbc5fa6d Status: Downloaded newer image for mongo:latest 169b2d38e2d821a6fd82cd126b6653274249d1972d33aae58986daffa588cd9b
Potrzebny też będzie serwer, który z tą bazą się będzie komunikował (cały serwer można pobrać z załącznika na dole strony). Ja do tego celu posłużyłem się napisanym b node prostym serwerem. Główna jego część, zawierająca połączenie do bazy danych wygląda następująco:
const express = require('express');
const mongoose = require('mongoose');
const wishesRouter = require('./routes/wishes.route');
const homeRouter = require('./routes/home.route');
const app = express();
app.use(express.json());
app.use('/', homeRouter);
app.use('/', wishesRouter);
app.get('/test', (req, res, next) => {
res.end('<h2>Hello test d!</h2>')
})
app.get('/wishes')
mongoose.connect(
// połączenie serwera za pomocą Docker-owego adresu IP
'mongodb://172.17.0.2:27017/wisches',
{ useNewUrlParser: true },
(err) => {
if (err) {
console.log(err);
} else {
app.listen(8888); // uruchomienie serwera na porcie 8888
}
}
)
Jak jednak zdobyć można informację o tym tajemniczym adresie ip ano bardzo prosto, korzystając z następującego polecenia:
docker container inspect mongodb
[
{
"Id": "169b2d38e2d821a6fd82cd126b6653274249d1972d33aae58986daffa588cd9b",
"Created": "2022-06-21T17:41:31.6836661Z",
"Path": "docker-entrypoint.sh",
"Args": [
"mongod"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 1505,
"ExitCode": 0,
"Error": "",
"StartedAt": "2022-06-21T17:41:32.3891246Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:c8b57c4bf7e3a88daf948d5d17bc7145db05771e928b3b3095ca4590719b5469",
"ResolvConfPath": "/var/lib/docker/containers/169b2d38e2d821a6fd82cd126b6653274249d1972d33aae58986daffa588cd9b/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/169b2d38e2d821a6fd82cd126b6653274249d1972d33aae58986daffa588cd9b/hostname",
"HostsPath": "/var/lib/docker/containers/169b2d38e2d821a6fd82cd126b6653274249d1972d33aae58986daffa588cd9b/hosts",
"LogPath": "/var/lib/docker/containers/169b2d38e2d821a6fd82cd126b6653274249d1972d33aae58986daffa588cd9b/169b2d38e2d821a6fd82cd126b6653274249d1972d33aae58986daffa588cd9b-json.log",
"Name": "/mongodb",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"CgroupnsMode": "host",
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "private",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
16,
229
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": [],
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DeviceRequests": null,
"KernelMemory": 0,
"KernelMemoryTCP": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": null,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/asound",
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware"
],
"ReadonlyPaths": [
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/67b62836de62d3e7c59b380b3d3bc08f86fc53b0390965de5a5971c2e9fba407-init/diff:/var/lib/docker/overlay2/3f6cdf147c5b72a6856b0f5fe8c8a9e1784f41414e0f70995381c556605873b7/diff:/var/lib/docker/overlay2/5568777fcac0002c758efce5b15c7294d5dc30f0820ddff79b20cdebbdaaaea4/diff:/var/lib/docker/overlay2/b7fb681e3766b6d75bededb284e42ea36d00e820a4664719e5fa2aa18a8ebb00/diff:/var/lib/docker/overlay2/38dc503d7a2f9be8c576dd2a0e626b44af9d76b5da02f98f8a655800f0a6ee49/diff:/var/lib/docker/overlay2/aab3aed4464bb0bf1728b98df88aa8b60867e22354609bfa1c35f4807747a097/diff:/var/lib/docker/overlay2/fdd7af1755e7d68564e4d81de7cf308a02a91c6c4907a50fdaeededabba8d913/diff:/var/lib/docker/overlay2/f8668dbfb96f13de188c0acc246aa1aaf2f003395f7ca2707aaceb610f21dca1/diff:/var/lib/docker/overlay2/952947c26d416fdf94c22df413c5821205438f031ceae1cba6d10fa3dbff3fb3/diff:/var/lib/docker/overlay2/dc2cc92060768807eb3db972956304d1ae5215ee75ca0c632133b869cdba6bd4/diff",
"MergedDir": "/var/lib/docker/overlay2/67b62836de62d3e7c59b380b3d3bc08f86fc53b0390965de5a5971c2e9fba407/merged",
"UpperDir": "/var/lib/docker/overlay2/67b62836de62d3e7c59b380b3d3bc08f86fc53b0390965de5a5971c2e9fba407/diff",
"WorkDir": "/var/lib/docker/overlay2/67b62836de62d3e7c59b380b3d3bc08f86fc53b0390965de5a5971c2e9fba407/work"
},
"Name": "overlay2"
},
"Mounts": [
{
"Type": "volume",
"Name": "d246cd882e4eaec88e68239aae16cee0fc9b2bf670a790e0a19442ece6e53375",
"Source": "/var/lib/docker/volumes/d246cd882e4eaec88e68239aae16cee0fc9b2bf670a790e0a19442ece6e53375/_data",
"Destination": "/data/configdb",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
},
{
"Type": "volume",
"Name": "35811e6ca86d47b69c9ac45326df4d4539b68e46bd87c10c954666b9b8a3a85a",
"Source": "/var/lib/docker/volumes/35811e6ca86d47b69c9ac45326df4d4539b68e46bd87c10c954666b9b8a3a85a/_data",
"Destination": "/data/db",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
}
],
"Config": {
"Hostname": "169b2d38e2d8",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"27017/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"GOSU_VERSION=1.12",
"JSYAML_VERSION=3.13.1",
"MONGO_PACKAGE=mongodb-org",
"MONGO_REPO=repo.mongodb.org",
"MONGO_MAJOR=5.0",
"MONGO_VERSION=5.0.9",
"HOME=/data/db"
],
"Cmd": [
"mongod"
],
"Image": "mongo",
"Volumes": {
"/data/configdb": {},
"/data/db": {}
},
"WorkingDir": "",
"Entrypoint": [
"docker-entrypoint.sh"
],
"OnBuild": null,
"Labels": {}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "e44cabced1c41817f34914209f9f53ebae9f751fb47f2161fba001d3f4645074",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"27017/tcp": null
},
"SandboxKey": "/var/run/docker/netns/e44cabced1c4",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "7dd0a804d6dfeedfc95666b3cadcd8c516a30532efe7782303f235f6bce78f2d",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:02",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"EndpointID": "7dd0a804d6dfeedfc95666b3cadcd8c516a30532efe7782303f235f6bce78f2d",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:02",
"DriverOpts": null
}
}
}
}
]Wśród nadmiaru informacji należy odnaleźć wpis: "IPAddress": "172.17.0.2", który jak zapewne odgadłeś zawiera ip kontenera.
Nie pozostało nic innego jak tylko zbudować obraz:
docker build -t node-api:1.0 .
by po chwili, lub co najwyżej dwóch oddać się najdzikszej rozkoszy uruchomienia nowej instancji kontenera:
docker run -p 8889:8888 --name node -v "${pwd}:/app" --rm -it node-api:1.0
> serwer-docker@1.0.0 start /app
> nodemon -L index.js
[nodemon] 2.0.16
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node index.js`Teraz można wypisać w przeglądarce: http://localhost:8889/wishes aby zobaczyć pustą listę życzeń. Używając zaś Postman-a można dodać jakieś życzenie:
Rys. 1
Docker - mongodb wysyłka żądania za pomocą Postmana