How can I see the options used to start a docker container?
Question
I took over an old PHP project that had an existing infrastructure (servers) up and running. Now I want to move to another provider, but reverse engineering how this is setup is a bit of a mystery. One "mystical" thing about that deployment was the various images and how they related, and the fact that they seemed to share data without any such thing being specified in the the Docker files.
I have now come to realize that it is possible to mount a volume that exists at another container when starting a container using --volumes-from and that is probably how it was done, but I wish I could see the command or options that did this. Is this possible (years later)?
Dockerfiles
Dockerfile.code.yml
This has all the PHP code. Does not seem to do much on its own, apart from logging stuff to stdout.
FROM debian:jessie
COPY . /var/www/myapp/
COPY deploy/parameters.yml.prod /var/www/myapp/app/config/parameters.yml
VOLUME /var/www/myapp/
COPY deploy/myapp-code-start.sh /myapp-code-start.sh
ENTRYPOINT /myapp-code-start.sh
Dockerfile.php-fpm.yml
This is the actual app, but as can be seen from the file, it has no code, which made me wonder how it could work.
FROM php:7.2-fpm
RUN apt update && apt install -y libpq-dev libcurl4-gnutls-dev libicu-dev
RUN docker-php-ext-install pdo_pgsql pgsql intl pcntl
RUN pecl install redis && docker-php-ext-enable redis
RUN usermod -u 1000 www-data
COPY deploy/php-config/uploads.ini /usr/local/etc/php/conf.d/
COPY deploy/myapp-app-start.sh /myapp-app-start.sh
ENTRYPOINT /myapp-app-start.sh
Docker output
Running containers
root@myapp-app2:~# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4551cbfdb140 128.18.125.254:5000/myapp-fpm:latest "/bin/sh -c /myapp-ap…" 19 months ago Up 8 months 10.135.17.193:9000->9000/tcp root_myapp-fpm_1
8018f756f345 128.18.125.254:5000/myapp-static:latest "nginx -g 'daemon of…" 19 months ago Up 8 months 80/tcp, 443/tcp, 10.135.17.193:8080->8080/tcp root_myapp-static_1
e2d5c3b22e65 128.68.125.254:5000/myapp-cron:latest "start-cron" 19 months ago Up 8 months root_myapp-cron_1
7713d5314f58 128.18.125.254:5000/myapp-code:latest "/bin/sh -c /myapp-co…" 19 months ago Up 8 months root_myapp-code_1
2080da8189fb redis:3-alpine "docker-entrypoint.s…" 19 months ago Up 8 months 10.135.17.193:6379->6379/tcp root_myapp-redis_1
Proof the code and FPM container share a volume
Showing the volumes using this .
root@myapp-app2:~# docker container inspect -f '{{range .Mounts}}{{.Type}}:{{.Source}}:{{.Destination}}{{println}}{{ end }}' root_myapp-fpm_1
volume:/var/lib/docker/volumes/6dfeffc141172fc3241c3a8b0d11be2348f41fe22afd74a9fb286e349cf77cbe/_data:/var/www/myapp
root@myapp-app2:~# docker container inspect -f '{{range .Mounts}}{{.Type}}:{{.Source}}:{{.Destination}}{{println}}{{ end }}' root_myapp-code_1
volume:/var/lib/docker/volumes/6dfeffc141172fc3241c3a8b0d11be2348f41fe22afd74a9fb286e349cf77cbe/_data:/var/www/myapp
EDIT: added output
Output from docker container inspect
root@myapp-app2:~# docker container inspect root_myapp-fpm_1
[
{
"Id": "4551cbfdb140315826d84536ff2339896f48aff4f168253dfe9624f4839571f5",
"Created": "2020-03-03T11:00:30.24298832Z",
"Path": "/bin/sh",
"Args": [
"-c",
"/myapp-app-start.sh"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 24657,
"ExitCode": 0,
"Error": "",
"StartedAt": "2021-01-19T23:01:06.178494041Z",
"FinishedAt": "2021-01-19T23:00:56.601585045Z"
},
"Image": "sha256:17b8f3c6bb49a1ad358aaffa9e53427bcbc9c72ca38a5ef9ebed92ca9e9e4c30",
"ResolvConfPath": "/var/lib/docker/containers/4551cbfdb140315826d84536ff2339896f48aff4f168253dfe9624f4839571f5/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/4551cbfdb140315826d84536ff2339896f48aff4f168253dfe9624f4839571f5/hostname",
"HostsPath": "/var/lib/docker/containers/4551cbfdb140315826d84536ff2339896f48aff4f168253dfe9624f4839571f5/hosts",
"LogPath": "/var/lib/docker/containers/4551cbfdb140315826d84536ff2339896f48aff4f168253dfe9624f4839571f5/4551cbfdb140315826d84536ff2339896f48aff4f168253dfe9624f4839571f5-json.log",
"Name": "/root_myapp-fpm_1",
"RestartCount": 0,
"Driver": "overlay",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "docker-default",
"ExecIDs": null,
"HostConfig": {
"Binds": [],
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "root_default",
"PortBindings": {
"9000/tcp": [
{
"HostIp": "10.135.17.193",
"HostPort": "9000"
}
]
},
"RestartPolicy": {
"Name": "always",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": [
"7713d5314f5812be835f23a69a5038c491b1eed8acbc7c05163db776caf9e294:rw"
],
"CapAdd": null,
"CapDrop": null,
"Capabilities": null,
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "shareable",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": null,
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": null,
"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/overlay/6297868c76dc68fed8629f8b17f269e0ac4bed82d6a2e9aec9540f977e9475de/root",
"MergedDir": "/var/lib/docker/overlay/0e206d71b9812feea939b313258e6647e1b1039c6b10e2d081a005ff5188f306/merged",
"UpperDir": "/var/lib/docker/overlay/0e206d71b9812feea939b313258e6647e1b1039c6b10e2d081a005ff5188f306/upper",
"WorkDir": "/var/lib/docker/overlay/0e206d71b9812feea939b313258e6647e1b1039c6b10e2d081a005ff5188f306/work"
},
"Name": "overlay"
},
"Mounts": [
{
"Type": "volume",
"Name": "6dfeffc141172fc3241c3a8b0d11be2348f41fe22afd74a9fb286e349cf77cbe",
"Source": "/var/lib/docker/volumes/6dfeffc141172fc3241c3a8b0d11be2348f41fe22afd74a9fb286e349cf77cbe/_data",
"Destination": "/var/www/myapp",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
}
],
"Config": {
"Hostname": "4551cbfdb140",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"9000/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"PHPIZE_DEPS=autoconf \t\tdpkg-dev \t\tfile \t\tg++ \t\tgcc \t\tlibc-dev \t\tmake \t\tpkg-config \t\tre2c",
"PHP_INI_DIR=/usr/local/etc/php",
"PHP_EXTRA_CONFIGURE_ARGS=--enable-fpm --with-fpm-user=www-data --with-fpm-group=www-data --disable-cgi",
"PHP_CFLAGS=-fstack-protector-strong -fpic -fpie -O2",
"PHP_CPPFLAGS=-fstack-protector-strong -fpic -fpie -O2",
"PHP_LDFLAGS=-Wl,-O1 -Wl,--hash-style=both -pie",
"GPG_KEYS=A917B1ECDA84AEC2B568FED6F50ABC807BD5DCD0 528995BFEDFBA7191D46839EF9BA0ADA31CBD89E 1729F83938DA44E27BA0F4D3DBDB397470D12172",
"PHP_VERSION=7.1.30",
"PHP_URL=https://www.php.net/get/php-7.1.30.tar.xz/from/this/mirror",
"PHP_ASC_URL=https://www.php.net/get/php-7.1.30.tar.xz.asc/from/this/mirror",
"PHP_SHA256=6310599811536dbe87e4bcf212bf93196bdfaff519d0c821e4c0068efd096a7c",
"PHP_MD5="
],
"Cmd": null,
"Image": "128.18.125.254:5000/myapp-fpm:latest",
"Volumes": null,
"WorkingDir": "/var/www/html",
"Entrypoint": [
"/bin/sh",
"-c",
"/myapp-app-start.sh"
],
"OnBuild": null,
"Labels": {
"com.docker.compose.config-hash": "df8cddcbc8c7112eb8b18b2c1637146b8784597453297142fa56cd69e4ef8ff3",
"com.docker.compose.container-number": "1",
"com.docker.compose.oneoff": "False",
"com.docker.compose.project": "root",
"com.docker.compose.service": "myapp-fpm",
"com.docker.compose.version": "1.8.0"
},
"StopSignal": "SIGQUIT"
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "25b66f536e29814970c16fc0f0518e6f5bb741db37ae4417d70ebff54110c512",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"9000/tcp": [
{
"HostIp": "10.135.17.193",
"HostPort": "9000"
}
]
},
"SandboxKey": "/var/run/docker/netns/25b66f536e29",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "",
"Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"MacAddress": "",
"Networks": {
"root_default": {
"IPAMConfig": null,
"Links": null,
"Aliases": [
"myapp-fpm",
"4551cbfdb140"
],
"NetworkID": "a6dd02493f7b5ba12701c5a73315b56ff3259edaad4ac27b7cbfd1182233d844",
"EndpointID": "00cdf1969d3835fd4f3e9b9face8b00c8255707656d285b754a4e19e90ae694e",
"Gateway": "172.18.0.1",
"IPAddress": "172.18.0.5",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:12:00:05",
"DriverOpts": null
}
}
}
}
]
1 answers
solution1
0 2021-09-29 08:21:20
I do see an interesting tidbit in the inspect output:
$ docker container inspect root_myapp-fpm_1 | jq .[0].HostConfig.VolumesFrom
[
"7713d5314f5812be835f23a69a5038c491b1eed8acbc7c05163db776caf9e294:rw"
]
This seems to imply it was started with --volumes-from 7713d5314f58 , which is using the id of the myapp-code image. I guess this is what I need to recreate the setup kind of , but that volume ID will change with every new deployment, so I needed to find out what started that with volumes_from .
Grepping the source code for volumes_from actually retrieved a docker-compose file:
version: "2"
services:
myapp-code:
image: 128.18.125.254:5000/myapp-code:latest
restart: always
depends_on:
- myapp-redis
myapp-fpm:
image: 128.18.125.254:5000/myapp-fpm:latest
restart: always
ports:
- "10.135.5.10:9000:9000"
volumes_from:
- myapp-code
depends_on:
- myapp-code
myapp-cron:
image: 128.18.125.254:5000/myapp-cron:latest
restart: always
volumes_from:
- myapp-code
depends_on:
- myapp-code
myapp-static:
image: 128.18.125.254:5000/myapp-static:latest
restart: always
ports:
- "10.125.5.10:8080:8080"
volumes_from:
- myapp-code
depends_on:
- myapp-code
myapp-redis:
image: redis:3-alpine
restart: always
ports:
- "10.125.1.12:6379:6379"
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.
Related Question
How can I start php-fpm in a Docker container by default?
Is there a command where we can see how long the docker container has been running?
How can I run my docker container with installed Nginx?
How do I run php-fpm when I start docker container?
How can I use a docker container with a self signed certificate on osx?
How can I mount a volume to docker container in OSX?
How can I verify if a file exist inside container docker?
How can I overwrite a file through Dockerfile in docker container?
How can I debug my docker container with phpStorm
How can I connect to a remote database outside of my Docker container?
Related Tags