Docker实践之镜像启动及常用命令

前面简单的介绍了如何在Linux中安装Docker，这节内容，我们学习Docker镜像启动

我们Docker启动镜像从哪里来呢？镜像由我们自己或者他人构建，构建好的镜像可以直接放在本地或者上传到远程镜像仓库。当我们运行一个Docker镜像时，会先在本地查找是否存在所要运行的镜像，如果没有则会去远程镜像仓库拉取，默认为官方的镜像仓库，当然，我们也可以改为自己的私有镜像仓库。接下来，我们先了解几个简单的命令。

• docker images 列出本地主机中的镜像
• docker pull [OPTIONS] 拉取镜像仓库中的镜像
• docker search [OPTIONS] 搜索仓库中的镜像
• docker rmi [OPTIONS] 删除本地镜像
• docker rm [OPTIONS] 删除容器
• docker run [OPTIONS] 启动镜像，先检查本地是否存在镜像，不存在则远程仓库下载
• docker build [OPTIONS] 构建镜像
• docker ps [OPTIONS] 运行中的镜像容器
• docker cp [OPTIONS] 宿主机与容器之间的文件复制

启动Nginx镜像

我们直接在安装好Docker的主机上执行docker run nginx

我们从运行日志可以看到这样的字眼:

Unable to find image 'nginx:latest' locally
latest: Pulling from library/nginx

docker发现本地不存在nginx的镜像文件，便直接去仓库中查找下载并运行,因为我们没有让镜像后台运行，所以这次运行起来的容器会随着这次远程连接断开而停止。当我按下ctrl+c时，容器便会停止

^C2021/12/28 03:24:32 [notice] 1#1: signal 2 (SIGINT) received, exiting
2021/12/28 03:24:32 [notice] 31#31: exiting
2021/12/28 03:24:32 [notice] 32#32: exiting
2021/12/28 03:24:32 [notice] 31#31: exit
2021/12/28 03:24:32 [notice] 32#32: exit
2021/12/28 03:24:32 [notice] 1#1: signal 17 (SIGCHLD) received from 31
2021/12/28 03:24:32 [notice] 1#1: worker process 31 exited with code 0
2021/12/28 03:24:32 [notice] 1#1: worker process 32 exited with code 0
2021/12/28 03:24:32 [notice] 1#1: exit

如果要让容器后台运行，则需要在启动时加-d这个参数,

[root@VM-12-3-centos ~]# docker run -d nginx
8dd8b3dd27aa28f913bea43de632d105c17901561d69c502b4433e0f473ed453

我们来看一下当前运行中的容器

[root@VM-12-3-centos ~]# docker ps
CONTAINER ID   IMAGE     COMMAND                  CREATED          STATUS          PORTS     NAMES
8dd8b3dd27aa   nginx     "/docker-entrypoint.…"   23 seconds ago   Up 23 seconds   80/tcp    goofy_faraday

可以看到，我们的nginx是启动起来了，但是，我们并不能访问它。容器有自己的一套虚拟系统，如：网络、文件。如果我们需要访问，则需要给容器和宿主机做一个映射，让宿主机和容器能够交互。这里，我们就给nginx增加端口和配置文件映射。我为了省事，就直接把容器中的配置文件复制出来用

docker cp 8dd8b3dd27aa:/etc/nginx/ ~/

接下来，我们便来建立这个映射关系

docker run -d --name nginx-c -v /root/nginx/:/etc/nginx/ -p 8888:80 nginx

来看看容器是否启动成功

[root@VM-12-3-centos nginx]# docker ps
CONTAINER ID   IMAGE     COMMAND                  CREATED         STATUS         PORTS                                   NAMES
5ae0319e1795   nginx     "/docker-entrypoint.…"   7 seconds ago   Up 6 seconds   0.0.0.0:8888->80/tcp, :::8888->80/tcp   nginx-c

这时候，我们便能访问我们的nginx服务，

前面已经说到，容器有自己虚拟系统，如果需要持久化的数据不映射到宿主机上，那么当容器销毁时，数据也会随之丢失，所以，我们在用容器运行时，一定要做好数据的保存方式。

Docker常用命令

在前面，我们列出了几个常用的Docker命令，这里，我们把这几个常用命令稍微讲解一下，

docker ps

ps主要是查询正常运行容器
docker ps 是当前正在运行的容器

[root@VM-12-3-centos nginx]# docker ps
CONTAINER ID   IMAGE     COMMAND                  CREATED             STATUS             PORTS                                   NAMES
5ae0319e1795   nginx     "/docker-entrypoint.…"   About an hour ago   Up About an hour   0.0.0.0:8888->80/tcp, :::8888->80/tcp   nginx-c

这里面的CONTAINER ID很重要，后面我们的很多操作都需要基于这个CONTAINER ID或者NAMES。
docker ps -a则是列出运行中和停止中的所有容器，

docker start/stop/restart/rm [CONTAINER ID]

这几个参数这是启动/停止/重启/删除容器的参数,如：docker restart 5ae0319e1795，如果要删除容器，必须要先停止，否则会提示

rror response from daemon: You cannot remove a running container 5ae0319e1795f3295247e0fa14c1d19054f59578381d8367e8955f22eebdd182. Stop the container before attempting removal or force remove

docker run

docker run [OPTIONS] IMAGE [COMMAND] [ARG…]，它的运行参数就比较复杂了，

[root@VM-12-3-centos nginx]# docker run --help

Usage:  docker run [OPTIONS] IMAGE [COMMAND] [ARG...]

Run a command in a new container

Options:
      --add-host list                  Add a custom host-to-IP mapping (host:ip)
  -a, --attach list                    Attach to STDIN, STDOUT or STDERR
      --blkio-weight uint16            Block IO (relative weight), between 10 and 1000, or 0 to disable (default 0)
      --blkio-weight-device list       Block IO weight (relative device weight) (default [])
      --cap-add list                   Add Linux capabilities
      --cap-drop list                  Drop Linux capabilities
      --cgroup-parent string           Optional parent cgroup for the container
      --cgroupns string                Cgroup namespace to use (host|private)
                                       'host':    Run the container in the Docker host's cgroup namespace
                                       'private': Run the container in its own private cgroup namespace
                                       '':        Use the cgroup namespace as configured by the
                                                  default-cgroupns-mode option on the daemon (default)
      --cidfile string                 Write the container ID to the file
      --cpu-period int                 Limit CPU CFS (Completely Fair Scheduler) period
      --cpu-quota int                  Limit CPU CFS (Completely Fair Scheduler) quota
      --cpu-rt-period int              Limit CPU real-time period in microseconds
      --cpu-rt-runtime int             Limit CPU real-time runtime in microseconds
  -c, --cpu-shares int                 CPU shares (relative weight)
      --cpus decimal                   Number of CPUs
      --cpuset-cpus string             CPUs in which to allow execution (0-3, 0,1)
      --cpuset-mems string             MEMs in which to allow execution (0-3, 0,1)
  -d, --detach                         Run container in background and print container ID
      --detach-keys string             Override the key sequence for detaching a container
      --device list                    Add a host device to the container
      --device-cgroup-rule list        Add a rule to the cgroup allowed devices list
      --device-read-bps list           Limit read rate (bytes per second) from a device (default [])
      --device-read-iops list          Limit read rate (IO per second) from a device (default [])
      --device-write-bps list          Limit write rate (bytes per second) to a device (default [])
      --device-write-iops list         Limit write rate (IO per second) to a device (default [])
      --disable-content-trust          Skip image verification (default true)
      --dns list                       Set custom DNS servers
      --dns-option list                Set DNS options
      --dns-search list                Set custom DNS search domains
      --domainname string              Container NIS domain name
      --entrypoint string              Overwrite the default ENTRYPOINT of the image
  -e, --env list                       Set environment variables
      --env-file list                  Read in a file of environment variables
      --expose list                    Expose a port or a range of ports
      --gpus gpu-request               GPU devices to add to the container ('all' to pass all GPUs)
      --group-add list                 Add additional groups to join
      --health-cmd string              Command to run to check health
      --health-interval duration       Time between running the check (ms|s|m|h) (default 0s)
      --health-retries int             Consecutive failures needed to report unhealthy
      --health-start-period duration   Start period for the container to initialize before starting health-retries countdown (ms|s|m|h) (default 0s)
      --health-timeout duration        Maximum time to allow one check to run (ms|s|m|h) (default 0s)
      --help                           Print usage
  -h, --hostname string                Container host name
      --init                           Run an init inside the container that forwards signals and reaps processes
  -i, --interactive                    Keep STDIN open even if not attached
      --ip string                      IPv4 address (e.g., 172.30.100.104)
      --ip6 string                     IPv6 address (e.g., 2001:db8::33)
      --ipc string                     IPC mode to use
      --isolation string               Container isolation technology
      --kernel-memory bytes            Kernel memory limit
  -l, --label list                     Set meta data on a container
      --label-file list                Read in a line delimited file of labels
      --link list                      Add link to another container
      --link-local-ip list             Container IPv4/IPv6 link-local addresses
      --log-driver string              Logging driver for the container
      --log-opt list                   Log driver options
      --mac-address string             Container MAC address (e.g., 92:d0:c6:0a:29:33)
  -m, --memory bytes                   Memory limit
      --memory-reservation bytes       Memory soft limit
      --memory-swap bytes              Swap limit equal to memory plus swap: '-1' to enable unlimited swap
      --memory-swappiness int          Tune container memory swappiness (0 to 100) (default -1)
      --mount mount                    Attach a filesystem mount to the container
      --name string                    Assign a name to the container
      --network network                Connect a container to a network
      --network-alias list             Add network-scoped alias for the container
      --no-healthcheck                 Disable any container-specified HEALTHCHECK
      --oom-kill-disable               Disable OOM Killer
      --oom-score-adj int              Tune host's OOM preferences (-1000 to 1000)
      --pid string                     PID namespace to use
      --pids-limit int                 Tune container pids limit (set -1 for unlimited)
      --platform string                Set platform if server is multi-platform capable
      --privileged                     Give extended privileges to this container
  -p, --publish list                   Publish a container's port(s) to the host
  -P, --publish-all                    Publish all exposed ports to random ports
      --pull string                    Pull image before running ("always"|"missing"|"never") (default "missing")
      --read-only                      Mount the container's root filesystem as read only
      --restart string                 Restart policy to apply when a container exits (default "no")
      --rm                             Automatically remove the container when it exits
      --runtime string                 Runtime to use for this container
      --security-opt list              Security Options
      --shm-size bytes                 Size of /dev/shm
      --sig-proxy                      Proxy received signals to the process (default true)
      --stop-signal string             Signal to stop a container (default "SIGTERM")
      --stop-timeout int               Timeout (in seconds) to stop a container
      --storage-opt list               Storage driver options for the container
      --sysctl map                     Sysctl options (default map[])
      --tmpfs list                     Mount a tmpfs directory
  -t, --tty                            Allocate a pseudo-TTY
      --ulimit ulimit                  Ulimit options (default [])
  -u, --user string                    Username or UID (format: <name|uid>[:<group|gid>])
      --userns string                  User namespace to use
      --uts string                     UTS namespace to use
  -v, --volume list                    Bind mount a volume
      --volume-driver string           Optional volume driver for the container
      --volumes-from list              Mount volumes from the specified container(s)
  -w, --workdir string                 Working directory inside the container

这里还是只介绍几个常用的命令参数吧，

• -d: 后台运行容器
• -P: 容器内部端口随机映射到主机的端口
• -p: 指定端口映射
• –name: 指定一个容器名称
• –cpuset: 指定CPU运行
• -m(–memory): 设置容器内存最大值(单位可以为 b,k,M,g；最小为4M),除了内存限制，还可以设置内存+交换分区大小(–memory-swap)
• –link=[]: 链接到另一个容器
• -v(–volume): 指定容器与宿主机的映射目录

运行示例docker run -d --name nginx-cc -v /root/nginx/:/etc/nginx/ -p 9999:80 -m 256M nginx

docker cp

cp命令主要是用于宿主机和容器间的文件复制，一般格式如下:
docker cp [OPTIONS] 容器名/容器Id:容器文件路径 宿主机文件路径 从容器复制到宿主机
docker cp [OPTIONS] 宿主机文件路径 容器名/容器Id:容器文件路径 从宿主机复制到容器中

docker inspect

inspect主要是查看容器或者镜像元数据，如：

[root@VM-12-3-centos nginx]# docker inspect cd1309c02a5e
[
    {
        "Id": "cd1309c02a5efc9855b0987e6dba44c6b858162f14dc7fbae4138b1ca4361dae",
        "Created": "2021-12-28T05:54:50.381961654Z",
        "Path": "/docker-entrypoint.sh",
        "Args": [
            "nginx",
            "-g",
            "daemon off;"
        ],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 3172754,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2021-12-28T05:54:50.720774527Z",
            "FinishedAt": "0001-01-01T00:00:00Z"
        },
        "Image": "sha256:f6987c8d6ed59543e9f34327c23e12141c9bad1916421278d720047ccc8e1bee",
        "ResolvConfPath": "/var/lib/docker/containers/cd1309c02a5efc9855b0987e6dba44c6b858162f14dc7fbae4138b1ca4361dae/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/cd1309c02a5efc9855b0987e6dba44c6b858162f14dc7fbae4138b1ca4361dae/hostname",
        "HostsPath": "/var/lib/docker/containers/cd1309c02a5efc9855b0987e6dba44c6b858162f14dc7fbae4138b1ca4361dae/hosts",
        "LogPath": "/var/lib/docker/containers/cd1309c02a5efc9855b0987e6dba44c6b858162f14dc7fbae4138b1ca4361dae/cd1309c02a5efc9855b0987e6dba44c6b858162f14dc7fbae4138b1ca4361dae-json.log",
        "Name": "/nginx-cc",
        "RestartCount": 0,
        "Driver": "overlay2",
        "Platform": "linux",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "",
        "ExecIDs": null,
        "HostConfig": {
            "Binds": [
                "/root/nginx/:/etc/nginx/"
            ],
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "json-file",
                "Config": {}
            },
            "NetworkMode": "default",
            "PortBindings": {
                "80/tcp": [
                    {
                        "HostIp": "",
                        "HostPort": "9999"
                    }
                ]
            },
            "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": [
                0,
                0
            ],
            "Isolation": "",
            "CpuShares": 0,
            "Memory": 268435456,
            "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": 536870912,
            "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/overlay2/8731f576cc3fb7511f9f9761e58d8480e2e6249889119962b9d0809e2105310b-init/diff:/var/lib/docker/overlay2/618f7e094534925da63be88e1409cf0020cc0b6561b266fafca8df4d77c07cf3/diff:/var/lib/docker/overlay2/05f6ffd411a6ec713698611d0a3732d55c7d6bf13105c736492734f1c32965cb/diff:/var/lib/docker/overlay2/47646e0e9a17db5299cbd0cbdc8a7ac300be03ed728f60fb331b6c236680859a/diff:/var/lib/docker/overlay2/fd51e460d7679d64ac84fed908c691f98ab6bcce6cddfaa947ace1071f541a52/diff:/var/lib/docker/overlay2/bebc9613df0154882c65ba436f084e864152fb77b9ff25f796d5f56bf8af7ff1/diff:/var/lib/docker/overlay2/5291486555a45b2adddeb8dbf77548c892f222b96c93208ccc87180025fb2a05/diff",
                "MergedDir": "/var/lib/docker/overlay2/8731f576cc3fb7511f9f9761e58d8480e2e6249889119962b9d0809e2105310b/merged",
                "UpperDir": "/var/lib/docker/overlay2/8731f576cc3fb7511f9f9761e58d8480e2e6249889119962b9d0809e2105310b/diff",
                "WorkDir": "/var/lib/docker/overlay2/8731f576cc3fb7511f9f9761e58d8480e2e6249889119962b9d0809e2105310b/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [
            {
                "Type": "bind",
                "Source": "/root/nginx",
                "Destination": "/etc/nginx",
                "Mode": "",
                "RW": true,
                "Propagation": "rprivate"
            }
        ],
        "Config": {
            "Hostname": "cd1309c02a5e",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "80/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "NGINX_VERSION=1.21.4",
                "NJS_VERSION=0.7.0",
                "PKG_RELEASE=1~bullseye"
            ],
            "Cmd": [
                "nginx",
                "-g",
                "daemon off;"
            ],
            "Image": "nginx",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": [
                "/docker-entrypoint.sh"
            ],
            "OnBuild": null,
            "Labels": {
                "maintainer": "NGINX Docker Maintainers <docker-maint@nginx.com>"
            },
            "StopSignal": "SIGQUIT"
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "f8caff2c6de91132584c5f577d8fa7a695d718a8fe91913842f8120a1fd755b2",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {
                "80/tcp": [
                    {
                        "HostIp": "0.0.0.0",
                        "HostPort": "9999"
                    },
                    {
                        "HostIp": "::",
                        "HostPort": "9999"
                    }
                ]
            },
            "SandboxKey": "/var/run/docker/netns/f8caff2c6de9",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "1840b9975ae073a167161b927ba9b5cbd5f523afc1deba41b935de41ed254025",
            "Gateway": "172.17.0.1",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "172.17.0.3",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
            "MacAddress": "02:42:ac:11:00:03",
            "Networks": {
                "bridge": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": null,
                    "NetworkID": "fed3528a99f04939a651d8b67872ec51e7b99dff8338726598e3ce0300ae7c93",
                    "EndpointID": "1840b9975ae073a167161b927ba9b5cbd5f523afc1deba41b935de41ed254025",
                    "Gateway": "172.17.0.1",
                    "IPAddress": "172.17.0.3",
                    "IPPrefixLen": 16,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "02:42:ac:11:00:03",
                    "DriverOpts": null
                }
            }
        }
    }
]

从返回的信息中，我们可以得到，启动时所设置的启动参数。如：

 "PortBindings": {
                "80/tcp": [
                    {
                        "HostIp": "",
                        "HostPort": "9999"
                    }
                ]
            },
"Binds": [
                "/root/nginx/:/etc/nginx/"
            ]

如果，那天我们忘记之前容器启动的参数时，便可以通过inspect来帮我们找回来。

docker logs

logs主要是查询docker容器的运行日志，如:

[root@VM-12-3-centos ~]# docker logs 5ae0319e1795
/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: IPv6 listen already enabled
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
2021/12/28 03:59:20 [notice] 1#1: using the "epoll" event method
2021/12/28 03:59:20 [notice] 1#1: nginx/1.21.4
2021/12/28 03:59:20 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6)
2021/12/28 03:59:20 [notice] 1#1: OS: Linux 4.18.0-305.3.1.el8.x86_64
2021/12/28 03:59:20 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
2021/12/28 03:59:20 [notice] 1#1: start worker processes
2021/12/28 03:59:20 [notice] 1#1: start worker process 24
2021/12/28 03:59:20 [notice] 1#1: start worker process 25
172.17.0.1 - - [28/Dec/2021:03:59:36 +0000] "GET / HTTP/1.1" 200 615 "-" "curl/7.61.1" "-"
2021/12/28 05:09:38 [notice] 1#1: signal 3 (SIGQUIT) received, shutting down
2021/12/28 05:09:38 [notice] 25#25: gracefully shutting down
2021/12/28 05:09:38 [notice] 25#25: exiting
2021/12/28 05:09:38 [notice] 25#25: exit
2021/12/28 05:09:38 [notice] 24#24: gracefully shutting down
2021/12/28 05:09:38 [notice] 24#24: exiting
2021/12/28 05:09:38 [notice] 24#24: exit
2021/12/28 05:09:38 [notice] 1#1: signal 17 (SIGCHLD) received from 24
2021/12/28 05:09:38 [notice] 1#1: worker process 24 exited with code 0
2021/12/28 05:09:38 [notice] 1#1: signal 29 (SIGIO) received
2021/12/28 05:09:38 [notice] 1#1: signal 17 (SIGCHLD) received from 25
2021/12/28 05:09:38 [notice] 1#1: worker process 25 exited with code 0
2021/12/28 05:09:38 [notice] 1#1: exit
/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: IPv6 listen already enabled
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
2021/12/28 05:09:38 [notice] 1#1: using the "epoll" event method
2021/12/28 05:09:38 [notice] 1#1: nginx/1.21.4
2021/12/28 05:09:38 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6)
2021/12/28 05:09:38 [notice] 1#1: OS: Linux 4.18.0-305.3.1.el8.x86_64
2021/12/28 05:09:38 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
2021/12/28 05:09:38 [notice] 1#1: start worker processes
2021/12/28 05:09:38 [notice] 1#1: start worker process 24
2021/12/28 05:09:38 [notice] 1#1: start worker process 25