go-judge

Fast, Simple, Secure

Quick Start

Install & Run

Download compiled executable executorserver for your platform from Release and run.

Or, by docker

docker run -it --rm --privileged --shm-size=256m -p 5050:5050 --name=executorserver criyle/executorserver

REST API

A REST service to run program in restricted environment (Listening on localhost:5050 by default).

/run POST execute program in the restricted environment (examples below)
/file GET list all cached file id to original name map
/file POST prepare a file in the executor service (in memory), returns fileId (can be referenced in /run parameter)
/file/:fileId GET downloads file from executor service (in memory), returns file content
/file/:fileId DELETE delete file specified by fileId
/ws WebSocket for /run
/version gets build git version (e.g. v1.4.0) together with runtime information (go version, os, platform)
/config gets some configuration (e.g. fileStorePath, runnerConfig) together with some supported features

REST API Interface

interface LocalFile {
    src: string; // absolute path for the file
}

interface MemoryFile {
    content: string | Buffer; // file contents
}

interface PreparedFile {
    fileId: string; // fileId defines file uploaded by /file
}

interface Collector {
    name: string; // file name in copyOut
    max: number;  // maximum bytes to collect from pipe
    pipe?: boolean; // collect over pipe or not (default false)
}

interface Symlink {
    symlink: string; // symlink destination (v1.6.0+)
}

interface Cmd {
    args: string[]; // command line argument
    env?: string[]; // environment

    // specifies file input / pipe collector for program file descriptors
    files?: (LocalFile | MemoryFile | PreparedFile | Collector)[];
    tty?: boolean; // enables tty on the input and output pipes (should have just one input & one output)
    // Notice: must have TERM environment variables (e.g. TERM=xterm)

    // limitations
    cpuLimit?: number;     // ns
    realCpuLimit?: number; // deprecated: use clock limit instead (still working)
    clockLimit?: number;   // ns
    memoryLimit?: number;  // byte
    stackLimit?: number;   // byte (N/A on windows, macOS cannot set over 32M)
    procLimit?: number;
    cpuRateLimit?: number; // limit cpu usage (1000 equals 1 cpu)
    cpuSetLimit?: string; // Linux only: set the cpuSet for cgroup
    strictMemoryLimit?: boolean; // Linux only: use stricter memory limit (+ rlimit_data when cgroup enabled)

    // copy the correspond file to the container dst path
    copyIn?: {[dst:string]:LocalFile | MemoryFile | PreparedFile | Symlink};

    // copy out specifies files need to be copied out from the container after execution
    // append '?' after file name will make the file optional and do not cause FileError when missing
    copyOut?: string[];
    // similar to copyOut but stores file in executor service and returns fileId, later download through /file/:fileId
    copyOutCached?: string[];
    // specifies the directory to dump container /w content
    copyOutDir: string
    // specifies the max file size to copy out
    copyOutMax?: number; // byte
}

enum Status {
    Accepted = 'Accepted', // normal
    MemoryLimitExceeded = 'Memory Limit Exceeded', // mle
    TimeLimitExceeded = 'Time Limit Exceeded', // tle
    OutputLimitExceeded = 'Output Limit Exceeded', // ole
    FileError = 'File Error', // fe
    NonzeroExitStatus = 'Nonzero Exit Status',
    Signalled = 'Signalled',
    InternalError = 'Internal Error', // system error
}

interface PipeIndex {
    index: number; // the index of cmd
    fd: number;    // the fd number of cmd
}

interface PipeMap {
    in: PipeIndex;  // input end of the pipe
    out: PipeIndex; // output end of the pipe
    // enable pipe proxy from in to out, 
    // content from in will be discarded if out closes
    proxy?: boolean; 
    name?: string;   // copy out proxy content if proxy enabled
    // limit the copy out content size, 
    // proxy will still functioning after max
    max?: number;    
}

enum FileErrorType {
    CopyInOpenFile = 'CopyInOpenFile',
    CopyInCreateFile = 'CopyInCreateFile',
    CopyInCopyContent = 'CopyInCopyContent',
    CopyOutOpen = 'CopyOutOpen',
    CopyOutNotRegularFile = 'CopyOutNotRegularFile',
    CopyOutSizeExceeded = 'CopyOutSizeExceeded',
    CopyOutCreateFile = 'CopyOutCreateFile',
    CopyOutCopyContent = 'CopyOutCopyContent',
    CollectSizeExceeded = 'CollectSizeExceeded',
}

interface FileError {
    name: string; // error file name
    type: FileErrorType; // type
    message?: string; // detailed message
}

interface Request {
    requestId?: string; // for WebSocket requests
    cmd: Cmd[];
    pipeMapping?: PipeMap[];
}

interface CancelRequest {
    cancelRequestId: string;
};

// WebSocket request
type WSRequest = Request | CancelRequest;

interface Result {
    status: Status;
    error?: string; // potential system error message
    exitStatus: number;
    time: number;   // ns (cgroup recorded time)
    memory: number; // byte
    runTime: number; // ns (wall clock time)
    // copyFile name -> content
    files?: {[name:string]:string};
    // copyFileCached name -> fileId
    fileIds?: {[name:string]:string};
    // fileError contains detailed file errors
    fileError?: FileError[];
}

// WebSocket results
interface WSResult {
    requestId: string;
    results: Result[];
    error?: string;
}

Example Request & Response

FFI

var ffi = require('ffi-napi');

var executor_server = ffi.Library('./executor_server', {
    'Init': ['int', ['string']],
    'Exec': ['string', ['string']],
    'FileList': ['string', []],
    'FileAdd': ['string', ['string']],
    'FileGet': ['string', ['string']],
    'FileDelete': ['string', ['string']]
});

if (executor_server.Init(JSON.stringify({
    cinitPath: "/judge/cinit",
    parallelism: 4,
}))) {
    console.log("Failed to init executor server");
}

const result = JSON.parse(executor_server.Exec(JSON.stringify({
    "cmd": [{
        "args": ["/bin/cat", "test.txt"],
        "env": ["PATH=/usr/bin:/bin"],
        "files": [{
            "content": ""
        }, {
            "name": "stdout",
            "max": 10240
        }, {
            "name": "stderr",
            "max": 10240
        }],
        "cpuLimit": 10000000000,
        "memoryLimit": 104857600,
        "procLimit": 50,
        "copyIn": {
            "test.txt": {
                "content": "TEST"
            }
        }
    }]
})));
console.log(result);

// Async
executor_server.Exec.async(JSON.stringify({
    "cmd": [{
        "args": ["/bin/cat", "test.txt"],
        "env": ["PATH=/usr/bin:/bin"],
        "files": [{
            "content": ""
        }, {
            "name": "stdout",
            "max": 10240
        }, {
            "name": "stderr",
            "max": 10240
        }],
        "cpuLimit": 10000000000,
        "memoryLimit": 104857600,
        "procLimit": 50,
        "copyIn": {
            "test.txt": {
                "content": "TEST"
            }
        }
    }]
}), (err, res) => {
    if (err) throw err;
    console.log(JSON.parse(res));
});

const fileAdd = (param) => new Promise((resolve, reject) => {
    executor_server.FileAdd.async(JSON.stringify(param), (err, res) => {
        if (err != null) { reject(err); } else { resolve(res); }
    });
});
const fileList = () => new Promise((resolve, reject) => {
    executor_server.FileList.async((err, res) => {
        if (err != null && res == null) { reject(err); } else { resolve(JSON.parse(res)); }
    });
});
const fileGet = (param) => new Promise((resolve, reject) => {
    executor_server.FileGet.async(JSON.stringify(param), (err, res) => {
        if (err != null && res == null) { reject(err); } else { resolve(res); }
    });
});
const fileDelete = (param) => new Promise((resolve, reject) => {
    executor_server.FileDelete.async(JSON.stringify(param), (err, res) => {
        if (err != null && res == null) { reject(err); } else { resolve(res); }
    });
});

const fileOps = async () => {
    const fileId = await fileAdd({ name: 'Name', content: 'Content' });
    console.log(fileId);
    const list = await fileList();
    console.log(list);
    const file = await fileGet({ id: fileId });
    console.log(file);
    const d = await fileDelete({ id: fileId });
    console.log(d);
    const e = await fileList();
    console.log(e);
};

fileOps();

Output:

{
  requestId: '',
  results: [
    {
      status: 'Accepted',
      exitStatus: 0,
      time: 814048,
      memory: 253952,
      files: [Object]
    }
  ]
}

Plese use PostMan or similar tools to send request to http://localhost:5050/run

Single (this example require `apt install g++` inside the container)

{
    "cmd": [{
        "args": ["/usr/bin/g++", "a.cc", "-o", "a"],
        "env": ["PATH=/usr/bin:/bin"],
        "files": [{
            "content": ""
        }, {
            "name": "stdout",
            "max": 10240
        }, {
            "name": "stderr",
            "max": 10240
        }],
        "cpuLimit": 10000000000,
        "memoryLimit": 104857600,
        "procLimit": 50,
        "copyIn": {
            "a.cc": {
                "content": "#include <iostream>\nusing namespace std;\nint main() {\nint a, b;\ncin >> a >> b;\ncout << a + b << endl;\n}"
            }
        },
        "copyOut": ["stdout", "stderr"],
        "copyOutCached": ["a.cc", "a"],
        "copyOutDir": "1"
    }]
}

[
    {
        "status": "Accepted",
        "exitStatus": 0,
        "time": 303225231,
        "memory": 32243712,
        "runTime": 524177700,
        "files": {
            "stderr": "",
            "stdout": ""
        },
        "fileIds": {
            "a": "5LWIZAA45JHX4Y4Z",
            "a.cc": "NOHPGGDTYQUFRSLJ"
        }
    }
]

{
    "cmd": [{
        "args": ["a"],
        "env": ["PATH=/usr/bin:/bin"],
        "files": [{
            "content": "1 1"
        }, {
            "name": "stdout",
            "max": 10240
        }, {
            "name": "stderr",
            "max": 10240
        }],
        "cpuLimit": 10000000000,
        "memoryLimit": 104857600,
        "procLimit": 50,
        "strictMemoryLimit": false,
        "copyIn": {
            "a": {
                "fileId": "5LWIZAA45JHX4Y4Z"
            }
        }
    }]
}

[
    {
        "status": "Accepted",
        "exitStatus": 0,
        "time": 1173000,
        "memory": 10637312,
        "runTime": 1100200,
        "files": {
            "stderr": "",
            "stdout": "2\n"
        }
    }
]

Multiple (interaction problem)

{
    "cmd": [{
        "args": ["/bin/cat", "1"],
        "env": ["PATH=/usr/bin:/bin"],
        "files": [{
            "content": ""
        }, null, {
            "name": "stderr",
            "max": 10240
        }],
        "cpuLimit": 1000000000,
        "memoryLimit": 1048576,
        "procLimit": 50,
        "copyIn": {
            "1": { "content": "TEST 1" }
        },
        "copyOut": ["stderr"]
    },
    {
        "args": ["/bin/cat"],
        "env": ["PATH=/usr/bin:/bin"],
        "files": [null, {
            "name": "stdout",
            "max": 10240
        }, {
            "name": "stderr",
            "max": 10240
        }],
        "cpuLimit": 1000000000,
        "memoryLimit": 1048576,
        "procLimit": 50,
        "copyOut": ["stdout", "stderr"]
    }],
    "pipeMapping": [{
        "in" : {"index": 0, "fd": 1 },
        "out" : {"index": 1, "fd" : 0 }
    }]
}

[
    {
        "status": "Accepted",
        "exitStatus": 0,
        "time": 1545123,
        "memory": 253952,
        "runTime": 4148800,
        "files": {
            "stderr": ""
        },
        "fileIds": {}
    },
    {
        "status": "Accepted",
        "exitStatus": 0,
        "time": 1501463,
        "memory": 253952,
        "runTime": 5897700,
        "files": {
            "stderr": "",
            "stdout": "TEST 1"
        },
        "fileIds": {}
    }
]

Compile On Windows (cygwin)

{
    "cmd": [{
        "args": ["C:\\Cygwin\\bin\\g++", "a.cc", "-o", "a"],
        "env": ["PATH=C:\\Cygwin\\bin;"],
        "files": [{
            "content": ""
        }, {
            "name": "stdout",
            "max": 10240
        }, {
            "name": "stderr",
            "max": 10240
        }],
        "cpuLimit": 10000000000,
        "memoryLimit": 104857600,
        "procLimit": 50,
        "copyIn": {
            "a.cc": {
                "content": "#include <iostream>\n#include <signal.h>\n#include <unistd.h>\nusing namespace std;\nint main() {\nint a, b;\ncin >> a >> b;\ncout << a + b << endl;\n}"
            }
        },
        "copyOutCached": ["a.exe"]
    }]
}

[
    {
        "status": "Accepted",
        "exitStatus": 0,
        "time": 140625000,
        "memory": 36286464,
        "files": {
            "stderr": "",
            "stdout": ""
        },
        "fileIds": {
            "a.exe": "HLQH2OF4MXUUJBCB"
        }
    }
]

Infinite loop with cpu rate control

{
 "cmd": [{
  "args": ["/usr/bin/python3", "1.py"],
  "env": ["PATH=/usr/bin:/bin"],
  "files": [{"content": ""}, {"name": "stdout","max": 10240}, {"name": "stderr","max": 10240}],
  "cpuLimit": 3000000000,
  "clockLimit": 4000000000,
  "memoryLimit": 104857600,
  "procLimit": 50,
  "cpuRate": 0.1,
  "copyIn": {
    "1.py": {
      "content": "while True:\n    pass"
    }
  }}]
}

[
    {
        "status": "Time Limit Exceeded",
        "exitStatus": 9,
        "time": 414803599,
        "memory": 3657728,
        "runTime": 4046054900,
        "files": {
            "stderr": "",
            "stdout": ""
        }
    }
]

Documentation

Prerequisite

Linux Kernel Version >= 3.10
Cgroup file system mounted at /sys/fs/cgroup. Usually done by systemd

Architecture

+----------------------------------------------------------------------------------+
| Transport Layer (HTTP / WebSocket / FFI / ...)                                   |
+----------------------------------------------------------------------------------+
| Executor Worker (Environment Pool w/ Environment Builder )                       |
+-----------------------------------------------------------+----------------------+
| EnvExec                                                   | File Store           |
+--------------------+----------------+---------------------+---------------+------+
| Linux (go-sandbox) | Windows (winc) | macOS (app sandbox) | Shared Memory | Disk |
+--------------------+----------------+---------------------+---------------+------+

Command Line Arguments

Server:

The default binding address for the executor server is localhost:5050. Can be specified with -http-addr flag.
By default gRPC endpoint is disabled, to enable gRPC endpoint, add -enable-grpc flag.
The default binding address for the gRPC executor server is localhost:5051. Can be specified with -grpc-addr flag.
The default log level is info, use -silent to disable logs or use -release to enable release logger (auto turn on if in docker).
-auth-token to add token-based authentication to REST / gRPC
By default, the GO debug endpoints (localhost:5052/debug) are disabled, to enable, specifies -enable-debug, and it also enables debug log
By default, the prometheus metrics endpoints (localhost:5052/metrics) are disabled, to enable, specifies -enable-metrics
Monitoring HTTP endpoint is enabled if metrics / debug is enabled, the default addr is localhost:5052 and can be specified by -monitor-addr

Sandbox:

The default concurrency equal to number of CPU, Can be specified with -parallelism flag.
The default file store is in memory, local cache can be specified with -dir flag.
The default CGroup prefix is executor_server, Can be specified with -cgroup-prefix flag.
-src-prefix to restrict src copyIn path split by comma (need to be absolute path) (example: /bin,/usr)
-time-limit-checker-interval specifies time limit checker interval (default 100ms) (valid value: [1ms, 1s])
-output-limit specifies size limit of POSIX rlimit of output (default 256MiB)
-extra-memory-limit specifies the additional memory limit to check memory limit exceeded (default 16KiB)
-copy-out-limit specifies the default file copy out max (default 64MiB)
-open-file-limit specifies the max number of open files (default 256)
-cpuset specifies cpuset.cpus cgroup for each container (Linux only)
-container-cred-start specifies container setuid / setgid credential start point (default: 10000) (Linux only)
- for example, by default container 0 will run with 10001 uid & gid and container 1 will run with 10002 uid & gid...
-enable-cpu-rate enabled cpu cgroup to control cpu rate using cfs_quota & cfs_period control (Linux only)
- -cpu-cfs-period specifies cfs_period if cpu rate is enabled (default 100ms) (valid value: [1ms, 1s])
-seccomp-conf specifies seecomp filter setting to load when running program (need build tag seccomp) (Linux only)
- for example, by strace -c prog to get all syscall needed and restrict to that sub set
- however, the syscall count in one platform(e.g. x86_64) is not suitable for all platform, so this option is not recommended
- the program killed by seccomp filter will have status Dangerous Syscall
-pre-fork specifies number of container to create when server starts
-tmp-fs-param specifies the tmpfs parameter for /w and /tmp when using default mounting (Linux only)
-file-timeout specifies maximum TTL for file created in file store （e.g. 30m)
-mount-conf specifies detailed mount configuration, please refer mount.yaml as a reference (Linux only)
-container-init-path specifies path to cinit (do not use, debug only) (Linux only)

Environment Variables

Environment variable will be override by command line arguments if they both present and all command line arguments have its correspond environment variable (e.g. ES_HTTP_ADDR). Run executorserver --help to see all the environment variable configurations.

Build Executor Server

Build by your own docker build -t executorserver -f Dockerfile.exec .

The executorserver need root privilege to create cgroup. Either creates sub-directory /sys/fs/cgroup/cpuacct/executor_server, /sys/fs/cgroup/memory/executor_server, /sys/fs/cgroup/pids/executor_server and make execution user readable or use sudo to run it.

Build Shared object

Build container init cinit:

go build -o cinit ./cmd/cinit

Build executor_server.so:

go build -buildmode=c-shared -o executor_server.so ./cmd/ffi/

For example, in JavaScript, run with ffi-napi (seems node 14 is not supported yet):

Build Executor Proxy

Build go build ./cmd/executorproxy

Run ./executorproxy, connect to gRPC endpoint expose as a REST endpoint.

Build Executor Shell

Build go build ./cmd/executorshell

Run ./executorshell, connect to gRPC endpoint with interactive shell.

Return Status

Accepted: Program exited with status code 0 within time & memory limits
Memory Limit Exceeded: Program uses more memory than memory limits
Time Limit Exceeded:
- Program uses more CPU time than cpuLimit
- Or, program uses more clock time than clockLimit
Output Limit Exceeded:
- Program output more than pipeCollector limits
- Or, program output more than output-limit
File Error:
- CopyIn file is not existed
- Or, CopyIn file too large for container file system
- Or, CopyOut file is not existed after program exited
Non Zero Exit Status: Program exited with non 0 status code within time & memory limits
Signalled: Program exited with signal (e.g. SIGSEGV)
Dangerous Syscall: Program killed by seccomp filter
Internal Error:
- Program is not exist
- Or, container create not successful (e.g. not privileged docker)
- Or, other errors

Container Root Filesystem

For linux platform, the default mounts points are bind mounting host's /lib, /lib64, /usr, /bin, /etc/ld.so.cache, /etc/alternatives, /etc/fpc.cfg, /dev/null, /dev/urandom, /dev/random, /dev/zero, /dev/full and mounts tmpfs at /w, /tmp and creates /proc.

To customize mount points, please look at example mount.yaml file.

tmpfs size for /w and /tmp is configured through -tmp-fs-param with default value size=128m,nr_inodes=4k

If a file named /.env exists in the container rootfs, the container will load the file as environment variable line by line.

If a bind mount is specifying a target within the previous mounted one, please ensure the target exists in the previous mount point.

Packages

envexec: run single / group of programs in parallel within restricted environment and resource constraints
env: reference implementation environments to inject into envexec

Windows Support

Build executorserver by: go build ./cmd/executorserver/
Build executor_server.dll: (need to install gcc as well) go build -buildmode=c-shared -o executor_server.so ./cmd/ffi/
Run: ./executorserver

Windows Security

Resources are limited by JobObject
Privillege are limited by Restricted Low Mandatory Level Token
Low Mandatory Level directory is created for read / write

MacOS Support

Build executorserver by: go build ./cmd/executorserver/
Build executor_server.dylib: (need to install XCode) go build -buildmode=c-shared -o executor_server.dylib ./cmd/ffi/
Run: ./executorserver

MacOS Security

sandbox-init profile deny network access and file read / write and read / write to /Users directory

Notice

cgroup v2 support

The cgroup v2 is supported by executorserver now when running as root since more Linux distribution are enabling cgroup v2 by default (e.g. Ubuntu 21.10+, Fedora 31+). However, due to missing memory.max_usage_in_bytes in memory controller, the memory usage is now accounted by maxrss returned by wait4 syscall. Thus, the memory usage appears higher than those who uses cgroup v1.

When running in containers, the executorserver will migrate all processed into /init hierarchy to enable nesting support.

CentOS 7

By default, user namespace is disabled and it can be enabled following stack overflow

echo user.max_user_namespaces=10000 >> /etc/sysctl.d/98-userns.conf
sysctl -p
# reboot make the config effective
reboot

Memory Usage

The controller will consume 20M memory and each container will consume 20M + size of tmpfs 2 * 128M. For each request, it consumes as much as user program limit + extra limit (16k) + total copy out max. Notice that the cached file stores in the shared memory (/dev/shm) of the host, so please ensure enough size allocated.

For example, when concurrency = 4, the executor itself can consume as much as 60 + (20+32) * 4M = 268M + 4 * total copy out + total max memory of requests.

Due to limitation of GO runtime, the memory will not return to OS automatically, which could lead to OOM killer. The background worker was introduced to checks heap usage and invokes GC when necessary.

-force-gc-target default 20m, the minimal size to trigger GC
-force-gc-interval default 5s, the interval to check memory usage

Benchmark

By wrk with t.lua: wrk -s t.lua -c 1 -t 1 -d 30s --latency http://localhost:5050/run.

However, these results are not the real use cases since the running time depends on the actual program specifies in the request. Normally, the executor server consumes ~1ms more compare to running without sandbox.

wrk.method = "POST"
wrk.body   = '{"cmd":[{"args":["/bin/cat","a.hs"],"env":["PATH=/usr/bin:/bin"],"files":[{"content":""},{"name":"stdout","max":10240},{"name":"stderr","max":10240}],"cpuLimit":10000000000,"memoryLimit":104857600,"procLimit":50,"copyIn":{"a.hs":{"content":"main = putStrLn \\"Hello, World!\\""},"b":{"content":"TEST"}}}]}'
wrk.headers["Content-Type"] = "application/json;charset=UTF-8"

Single thread ~800-860 op/s Windows 10 WSL2 @ 5800X
Multi thread ~4500-6000 op/s Windows 10 WSL2 @ 5800X

Single thread:

Running 30s test @ http://localhost:5050/run
  1 threads and 1 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     1.16ms  132.89us   6.20ms   90.15%
    Req/Sec     0.87k    19.33     0.91k    85.33%
  Latency Distribution
     50%    1.13ms
     75%    1.18ms
     90%    1.27ms
     99%    1.61ms
  25956 requests in 30.01s, 6.88MB read
Requests/sec:    864.88
Transfer/sec:    234.68KB

Name		Name	Last commit message	Last commit date
Latest commit History 246 Commits
.github/workflows		.github/workflows
cmd		cmd
env		env
envexec		envexec
filestore		filestore
pb		pb
worker		worker
.air.toml		.air.toml
.dockerignore		.dockerignore
.gitignore		.gitignore
.goreleaser.yaml		.goreleaser.yaml
Dockerfile.alpine		Dockerfile.alpine
Dockerfile.exec		Dockerfile.exec
Dockerfile.goreleaser		Dockerfile.goreleaser
LICENSE		LICENSE
README.cn.md		README.cn.md
README.md		README.md
containerPasswd.txt		containerPasswd.txt
dotenv		dotenv
go.mod		go.mod
go.sum		go.sum
mount.yaml		mount.yaml

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go-judge

Quick Start

Install & Run

REST API

REST API Interface

Example Request & Response

Documentation

Prerequisite

Architecture

Command Line Arguments

Environment Variables

Build Executor Server

Build Shared object

Build Executor Proxy

Build Executor Shell

Return Status

Container Root Filesystem

Packages

Windows Support

Windows Security

MacOS Support

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Notice

cgroup v2 support

CentOS 7

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Benchmark

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go-judge

Quick Start

Install & Run

REST API

REST API Interface

Example Request & Response

Documentation

Prerequisite

Architecture

Command Line Arguments

Environment Variables

Build Executor Server

Build Shared object

Build Executor Proxy

Build Executor Shell

Return Status

Container Root Filesystem

Packages

Windows Support

Windows Security

MacOS Support

MacOS Security

Notice

cgroup v2 support

CentOS 7

Memory Usage

Benchmark

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