no servers inside upstream in /etc/nginx/conf.d/default.conf when specifying an hostname

[daisukixci]

I use docker-gen through nginx-proxy and got this nginx-proxy/nginx-proxy#1548 which seems to be linked to docker-gen. It seems it can't find the ip of the other container with netiher /proc/self/cgroup" nor "/proc/self/mountinfo" (It seems I miss understood how the IP of the others containers was found). FYI I use docker swarm on arch, Here is my docker info

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc., v0.5.1-tp-docker)

Server:
 Containers: 10
  Running: 5
  Paused: 0
  Stopped: 5
 Images: 31
 Server Version: 20.10.5
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: active
  NodeID: REDACTED
  Is Manager: true
  ClusterID: REDACTED
  Managers: 1
  Nodes: 1
  Default Address Pool: 10.0.0.0/8
  SubnetSize: 24
  Data Path Port: 4789
  Orchestration:
   Task History Retention Limit: 5
  Raft:
   Snapshot Interval: 10000
   Number of Old Snapshots to Retain: 0
   Heartbeat Tick: 1
   Election Tick: 10
  Dispatcher:
   Heartbeat Period: 5 seconds
  CA Configuration:
   Expiry Duration: 3 months
   Force Rotate: 0
  Autolock Managers: false
  Root Rotation In Progress: false
  Node Address: REDACTED
  Manager Addresses:
   REDACTED
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 05f951a3781f4f2c1911b05e61c160e9c30eaa8e.m
 runc version: 12644e614e25b05da6fd08a38ffa0cfe1903fdec
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 5.11.11-arch1-1
 Operating System: Arch Linux
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 15.59GiB
 Name: REDACTED
 ID: XB5C:65VO:KHNJ:DLXF:NGS2:LDHI:HX34:EOJW:PWSZ:IURK:UKSW:WFCJ
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: Support for cgroup v2 is experimental

[daisukixci]

Ok my problems was the specified hostname like said in #336 (comment).
I don't see issue to track the regression, so i leave open this one, feel free to close it as my issue is solved by removing hostname entries.

[Syphdias]

I experience the same issue. No upstream servers. I use the nginx.tmpl from nginx-proxy. Like suggested by the docker hub page.

I tried to debug it and added some lines to the template at the top:

{{ $CurrentContainer := where $ "ID" .Docker.CurrentContainerID | first }}
{{ $CurrentContainer }} 
{{ where $ "ID" .Docker.CurrentContainerID }}

Line 1 is in there by default and is later used to compare if a potential backend container is in the same network as the current container. Line 2 and 3 I added and it looks like they are empty:

<no value> 
[]

I'm not good at go templates but I see there is a RuntimeContainer struct with Networks in the README (templateing). But I cannot figure out how to access it to fix the template. .RuntimeContainer.Networks did not work.

[buchdag]

@Syphdias could you post the result of docker inspect youdockergencontainer ?

[Syphdias]

Sure

❯ docker-compose exec revproxy-gen /usr/local/bin/docker-gen --version # for good measure
0.7.5
❯ docker inspect revproxy-gen
[
    {
        "Id": "d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e",
        "Created": "2021-04-10T15:13:25.659568865Z",
        "Path": "/usr/local/bin/docker-gen",
        "Args": [
            "-notify-sighup",
            "revproxy",
            "-watch",
            "-only-exposed",
            "/etc/docker-gen/templates/nginx.tmpl",
            "/etc/nginx/conf.d/default.conf"
        ],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 221692,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2021-04-10T20:11:19.517464833Z",
            "FinishedAt": "2021-04-10T20:11:18.709340623Z"
        },
        "Image": "sha256:a467dff5e74dfc91427f4b0403fb5543584a5fb4e429d34d2e94b2ea337a8215",
        "ResolvConfPath": "/var/lib/docker/containers/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e/hostname",
        "HostsPath": "/var/lib/docker/containers/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e/hosts",
        "LogPath": "/var/lib/docker/containers/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e-json.log",
        "Name": "/revproxy-gen",
        "RestartCount": 0,
        "Driver": "overlay2",
        "Platform": "linux",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "docker-default",
        "ExecIDs": null,
        "HostConfig": {
            "Binds": [
                "/var/run/docker.sock:/tmp/docker.sock:rw",
                "/home/syphdias/docker/revproxy/nginx.tmpl:/etc/docker-gen/templates/nginx.tmpl:rw"
            ],
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "json-file",
                "Config": {}
            },
            "NetworkMode": "revproxy_backend",
            "PortBindings": {},
            "RestartPolicy": {
                "Name": "unless-stopped",
                "MaximumRetryCount": 0
            },
            "AutoRemove": false,
            "VolumeDriver": "",
            "VolumesFrom": [
                "09f7256e82f3f08d2efb8b0135a0aef213c47c3b111d09358f8735f0cc0c321f:rw"
            ],
            "CapAdd": null,
            "CapDrop": null,
            "CgroupnsMode": "host",
            "Dns": null,
            "DnsOptions": null,
            "DnsSearch": null,
            "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": [
                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/overlay2/cd31ae31ae1aede18ad8c98c5f46703a9b5b41f1ddbb58477e0867c9a485bc6a-init/diff:/var/lib/docker/overlay2/4e3589f7badb112db34b5e938ee3219693bca0aa037b4eea3aee9d3425981260/diff:/var/lib/docker/overlay2/7148944f948af3a2193fcdcfe9255032a505e62bbf7501c91db8925df37f5e2b/diff:/var/lib/docker/overlay2/a354b31fa8aad270d396da5227bc5b2f1a1e62c0db59a8ad845fd4e192ced0b1/diff",
                "MergedDir": "/var/lib/docker/overlay2/cd31ae31ae1aede18ad8c98c5f46703a9b5b41f1ddbb58477e0867c9a485bc6a/merged",
                "UpperDir": "/var/lib/docker/overlay2/cd31ae31ae1aede18ad8c98c5f46703a9b5b41f1ddbb58477e0867c9a485bc6a/diff",
                "WorkDir": "/var/lib/docker/overlay2/cd31ae31ae1aede18ad8c98c5f46703a9b5b41f1ddbb58477e0867c9a485bc6a/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [
            {
                "Type": "volume",
                "Name": "revproxy_nginx-conf",
                "Source": "/var/lib/docker/volumes/revproxy_nginx-conf/_data",
                "Destination": "/etc/nginx/conf.d",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            },
            {
                "Type": "bind",
                "Source": "/var/run/docker.sock",
                "Destination": "/tmp/docker.sock",
                "Mode": "rw",
                "RW": true,
                "Propagation": "rprivate"
            },
            {
                "Type": "bind",
                "Source": "/home/syphdias/docker/revproxy/nginx.tmpl",
                "Destination": "/etc/docker-gen/templates/nginx.tmpl",
                "Mode": "rw",
                "RW": true,
                "Propagation": "rprivate"
            },
            {
                "Type": "bind",
                "Source": "/home/syphdias/docker-data/certs/letsencrypt/live/redacted.com/fullchain.pem",
                "Destination": "/etc/nginx/certs/redacted.com.crt",
                "Mode": "",
                "RW": false,
                "Propagation": "rprivate"
            },
            {
                "Type": "bind",
                "Source": "/home/syphdias/docker-data/certs/letsencrypt/live/redacted.com/privkey.pem",
                "Destination": "/etc/nginx/certs/redacted.com.key",
                "Mode": "",
                "RW": false,
                "Propagation": "rprivate"
            }
        ],
        "Config": {
            "Hostname": "d8411145f6d7",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "SSL_POLICY=Mozilla-Modern",
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "VERSION=0.7.5",
                "DOCKER_HOST=unix:///tmp/docker.sock"
            ],
            "Cmd": [
                "-notify-sighup",
                "revproxy",
                "-watch",
                "-only-exposed",
                "/etc/docker-gen/templates/nginx.tmpl",
                "/etc/nginx/conf.d/default.conf"
            ],
            "Image": "jwilder/docker-gen:0.7.5",
            "Volumes": {
                "/etc/docker-gen/templates/nginx.tmpl": {},
                "/tmp/docker.sock": {}
            },
            "WorkingDir": "",
            "Entrypoint": [
                "/usr/local/bin/docker-gen"
            ],
            "OnBuild": null,
            "Labels": {
                "com.docker.compose.config-hash": "6c7e681cd63280d323b72baa96aa6215cab8beb88473d7834d50ee9340854ff5",
                "com.docker.compose.container-number": "1",
                "com.docker.compose.oneoff": "False",
                "com.docker.compose.project": "revproxy",
                "com.docker.compose.project.config_files": "docker-compose.yml",
                "com.docker.compose.project.working_dir": "/home/syphdias/docker/revproxy",
                "com.docker.compose.service": "revproxy-gen",
                "com.docker.compose.version": "1.28.6",
                "maintainer": "Jason Wilder <mail@jasonwilder.com>"
            }
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "69c1087908801795f67f0a2f862d6a70a7f214f1d1d254c603df914d9626c081",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {},
            "SandboxKey": "/var/run/docker/netns/69c108790880",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "",
            "Gateway": "",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "",
            "IPPrefixLen": 0,
            "IPv6Gateway": "",
            "MacAddress": "",
            "Networks": {
                "revproxy_backend": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": [
                        "revproxy-gen",
                        "d8411145f6d7"
                    ],
                    "NetworkID": "c70404d73a369d78551310a1d3414c6a59b3c8f714653441bac558709e1716f8",
                    "EndpointID": "ea7b1ccf1abe3b0631612f989aa312304a4830bc7196ef675d0dcf4197277b7b",
                    "Gateway": "172.18.0.1",
                    "IPAddress": "172.18.0.9",
                    "IPPrefixLen": 16,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "02:42:ac:12:00:09",
                    "DriverOpts": null
                }
            }
        }
    }
]

Edit: Just in case:

❯ docker --version
Docker version 20.10.5, build 55c4c88966

[buchdag]

@Syphdias thanks, could you also post results of

 docker exec revproxy-gen cat /proc/1/cpuset
 docker exec revproxy-gen cat /proc/self/cgroup
 docker exec revproxy-gen cat /proc/self/mountinfo

[Syphdias]

Will check as soon as I am home. I guess you are suspecting not enough privileges or capabilities?

[buchdag]

The last two files are currently used to search for the container ID, the first one will be added by #336. I'm curious to see if your container ID is actually inside one of those files, and if not why / how should we update the GetCurrentContainerID() function to work in this case.

[Syphdias]

❯ docker exec revproxy-gen cat /proc/1/cpuset
/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
❯ docker exec revproxy-gen cat /proc/self/cgroup
12:rdma:/
11:cpuset:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
10:blkio:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
9:freezer:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
8:hugetlb:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
7:memory:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
6:perf_event:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
5:devices:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
4:pids:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
3:net_cls,net_prio:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
2:cpu,cpuacct:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
1:name=systemd:/docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e
0::/system.slice/docker.service
❯ docker exec revproxy-gen cat /proc/self/mountinfo
1422 1337 0:68 / / rw,relatime master:459 - overlay overlay rw,lowerdir=/var/lib/docker/overlay2/l/ZSACOL773WXPGHNWG2EH7AH6FO:/var/lib/docker/overlay2/l/V7XSR656VLMXCMUBSAA4DV3I2G:/var/lib/docker/overlay2/l/HH2GJ6T6C7QKS6ADY3DLKO6SBB:/var/lib/docker/overlay2/l/LOUMZPZEZQAFTW5AAAFBK4A5RH,upperdir=/var/lib/docker/overlay2/cd31ae31ae1aede18ad8c98c5f46703a9b5b41f1ddbb58477e0867c9a485bc6a/diff,workdir=/var/lib/docker/overlay2/cd31ae31ae1aede18ad8c98c5f46703a9b5b41f1ddbb58477e0867c9a485bc6a/work,index=off
1423 1422 0:94 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw
1424 1422 0:95 / /dev rw,nosuid - tmpfs tmpfs rw,size=65536k,mode=755,inode64
1425 1424 0:96 / /dev/pts rw,nosuid,noexec,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=666
1426 1422 0:97 / /sys ro,nosuid,nodev,noexec,relatime - sysfs sysfs ro
1427 1426 0:98 / /sys/fs/cgroup rw,nosuid,nodev,noexec,relatime - tmpfs tmpfs rw,mode=755,inode64
1428 1427 0:30 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/systemd ro,nosuid,nodev,noexec,relatime master:11 - cgroup cgroup rw,xattr,name=systemd
1429 1427 0:33 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/cpu,cpuacct ro,nosuid,nodev,noexec,relatime master:15 - cgroup cgroup rw,cpu,cpuacct
1430 1427 0:34 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/net_cls,net_prio ro,nosuid,nodev,noexec,relatime master:16 - cgroup cgroup rw,net_cls,net_prio
1431 1427 0:35 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/pids ro,nosuid,nodev,noexec,relatime master:17 - cgroup cgroup rw,pids
1432 1427 0:36 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/devices ro,nosuid,nodev,noexec,relatime master:18 - cgroup cgroup rw,devices
1433 1427 0:37 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/perf_event ro,nosuid,nodev,noexec,relatime master:19 - cgroup cgroup rw,perf_event
1434 1427 0:38 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/memory ro,nosuid,nodev,noexec,relatime master:20 - cgroup cgroup rw,memory
1435 1427 0:39 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/hugetlb ro,nosuid,nodev,noexec,relatime master:21 - cgroup cgroup rw,hugetlb
1436 1427 0:40 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/freezer ro,nosuid,nodev,noexec,relatime master:22 - cgroup cgroup rw,freezer
1437 1427 0:41 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/blkio ro,nosuid,nodev,noexec,relatime master:23 - cgroup cgroup rw,blkio
1438 1427 0:42 /docker/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e /sys/fs/cgroup/cpuset ro,nosuid,nodev,noexec,relatime master:24 - cgroup cgroup rw,cpuset
1439 1427 0:43 / /sys/fs/cgroup/rdma ro,nosuid,nodev,noexec,relatime master:25 - cgroup cgroup rw,rdma
1440 1424 0:87 / /dev/mqueue rw,nosuid,nodev,noexec,relatime - mqueue mqueue rw
1441 1424 0:99 / /dev/shm rw,nosuid,nodev,noexec,relatime - tmpfs shm rw,size=65536k,inode64
1442 1422 0:24 /docker.sock /tmp/docker.sock rw,nosuid,nodev,relatime - tmpfs run rw,mode=755,inode64
1443 1422 259:2 /var/lib/docker/containers/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e/hosts /etc/hosts rw,noatime - ext4 /dev/nvme0n1p2 rw
1444 1422 259:2 /var/lib/docker/containers/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e/resolv.conf /etc/resolv.conf rw,noatime - ext4 /dev/nvme0n1p2 rw
1445 1422 259:2 /var/lib/docker/containers/d8411145f6d775560b9169f5347d433a6ea32b01fb9a3903d50a98bae4a0421e/hostname /etc/hostname rw,noatime - ext4 /dev/nvme0n1p2 rw
1446 1422 259:2 /var/lib/docker/volumes/revproxy_nginx-conf/_data /etc/nginx/conf.d rw,noatime master:1 - ext4 /dev/nvme0n1p2 rw
1448 1422 259:2 /home/syphdias/docker/revproxy/nginx.tmpl /etc/docker-gen/templates/nginx.tmpl rw,noatime - ext4 /dev/nvme0n1p2 rw
1449 1422 259:2 /home/syphdias/docker-data/certs/letsencrypt/archive/example.com/fullchain6.pem /etc/nginx/certs/example.com.crt ro,noatime - ext4 /dev/nvme0n1p2 rw
1450 1422 259:2 /home/syphdias/docker-data/certs/letsencrypt/archive/example.com/privkey6.pem /etc/nginx/certs/example.com.key ro,noatime - ext4 /dev/nvme0n1p2 rw
1338 1423 0:94 /bus /proc/bus ro,relatime - proc proc rw
1339 1423 0:94 /fs /proc/fs ro,relatime - proc proc rw
1340 1423 0:94 /irq /proc/irq ro,relatime - proc proc rw
1341 1423 0:94 /sys /proc/sys ro,relatime - proc proc rw
1342 1423 0:94 /sysrq-trigger /proc/sysrq-trigger ro,relatime - proc proc rw
1343 1423 0:181 / /proc/asound ro,relatime - tmpfs tmpfs ro,inode64
1344 1423 0:182 / /proc/acpi ro,relatime - tmpfs tmpfs ro,inode64
1345 1423 0:95 /null /proc/kcore rw,nosuid - tmpfs tmpfs rw,size=65536k,mode=755,inode64
1346 1423 0:95 /null /proc/keys rw,nosuid - tmpfs tmpfs rw,size=65536k,mode=755,inode64
1347 1423 0:95 /null /proc/latency_stats rw,nosuid - tmpfs tmpfs rw,size=65536k,mode=755,inode64
1349 1423 0:95 /null /proc/timer_list rw,nosuid - tmpfs tmpfs rw,size=65536k,mode=755,inode64
1350 1423 0:95 /null /proc/sched_debug rw,nosuid - tmpfs tmpfs rw,size=65536k,mode=755,inode64
1351 1423 0:183 / /proc/scsi ro,relatime - tmpfs tmpfs ro,inode64
1352 1426 0:184 / /sys/firmware ro,relatime - tmpfs tmpfs ro,inode64

[Syphdias]

I saw the merge #345. Will the template need to change? Because I tried latest it and it's still broken:

❯ doc exec revproxy-gen head -3 /etc/docker-gen/templates/nginx.tmpl
{{ $CurrentContainer := where $ "ID" .Docker.CurrentContainerID | first }}
{{ $CurrentContainer }} 
{{ where $ "ID" .Docker.CurrentContainerID }}
❯ doc exec revproxy-gen /usr/local/bin/docker-gen -only-exposed /etc/docker-gen/templates/nginx.tmpl |head -2
<no value> 
[]
❯ docker inspect revproxy-gen |jq '.[].Image'
"sha256:c333921e96464c8abdc5d5db1a724a8f6ad5a358b2c9362c4e93d64d9d9a95ff"
❯ docker inspect c333921e9646 |jq '.[].RepoDigests[]'
"jwilder/docker-gen@sha256:4a88cb1ddb519b646e2966eba2d1b810189b906229eb72fb5b6c5faff289c3ee"

[Syphdias]

Oh, btw .Docker.CurrentContainerID yields the same result as docker inspect revproxy-gen |jq '.[].Id' -r.

[Syphdias]

Found a fix:
-only-exposed excludes the docker-gen container from the variable $ thus it can no longer be found by ID. I guess there are two options:

1. expose a port
2. don't use -only-exposed

[Insomniacnomis]

Found a fix:
-only-exposed excludes the docker-gen container from the variable $ thus it can no longer be found by ID. I guess there are two options:

1. expose a port
2. don't use -only-exposed

This fixed it for me