Kubernetes Client Library for C

This is the official Kubernetes client library for the C programming language. It is a work in progress and should be considered alpha quality software at this time.

Building the library

# Clone the repo
git clone https://github.com/kubernetes-client/c
CLIENT_REPO_ROOT=${PWD}/c

# Install pre-requisites
sudo apt-get install libssl-dev libcurl4-openssl-dev uncrustify libyaml-dev

# Move into the Kubernetes directory
cd ${CLIENT_REPO_ROOT}/kubernetes

# Build
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=/usr/local/lib ..
make
sudo make install

Building an example

cd ${CLIENT_REPO_ROOT}/examples/list_pod
make

Running the example

./list_pod_bin

Usage example

list all pods:

    char *basePath = NULL;
    sslConfig_t *sslConfig = NULL;
    list_t *apiKeys = NULL;
    int rc = load_kube_config(&basePath, &sslConfig, &apiKeys, NULL);/* NULL means loading configuration from $HOME/.kube/config */
    if (rc != 0) {
        printf("Cannot load kubernetes configuration.\n");
        return -1;
    }
    apiClient_t *apiClient = apiClient_create_with_base_path(basePath, sslConfig, apiKeys);
    if (!apiClient) {
        printf("Cannot create a kubernetes client.\n");
        return -1;
    }

    v1_pod_list_t *pod_list = NULL;
    pod_list = CoreV1API_listNamespacedPod(apiClient,
                                          "default",    /*namespace */
                                           NULL,    /* pretty */
                                           0,       /* allowWatchBookmarks */
                                           NULL,    /* continue */
                                           NULL,    /* fieldSelector */
                                           NULL,    /* labelSelector */
                                           0,       /* limit */
                                           NULL,    /* resourceVersion */
                                           0,       /* timeoutSeconds */
                                           0        /* watch */
        );
    printf("return code=%ld\n", apiClient->response_code);
    if (pod_list) {
      ...
    }

    apiClient_free(apiClient);
    apiClient = NULL;
    free_client_config(basePath, sslConfig, apiKeys);
    basePath = NULL;
    sslConfig = NULL;
    apiKeys = NULL;
    apiClient_unsetupGlobalEnv();

list all pods in cluster:

    char *basePath = NULL;
    sslConfig_t *sslConfig = NULL;
    list_t *apiKeys = NULL;
    int rc = load_incluster_config(&basePath, &sslConfig, &apiKeys);
    if (rc != 0) {
        printf("Cannot load kubernetes configuration in cluster.\n");
        return -1;
    }
    apiClient_t *apiClient = apiClient_create_with_base_path(basePath, sslConfig, apiKeys);
    if (!apiClient) {
        printf("Cannot create a kubernetes client.\n");
        return -1;
    }

    v1_pod_list_t *pod_list = NULL;
    pod_list = CoreV1API_listNamespacedPod(apiClient,
                                          "default",    /*namespace */
                                           NULL,    /* pretty */
                                           0,       /* allowWatchBookmarks */
                                           NULL,    /* continue */
                                           NULL,    /* fieldSelector */
                                           NULL,    /* labelSelector */
                                           0,       /* limit */
                                           NULL,    /* resourceVersion */
                                           0,       /* timeoutSeconds */
                                           0        /* watch */
        );
    printf("return code=%ld\n", apiClient->response_code);
    if (pod_list) {
      ...
    }

    apiClient_free(apiClient);
    apiClient = NULL;
    free_client_config(basePath, sslConfig, apiKeys);
    basePath = NULL;
    sslConfig = NULL;
    apiKeys = NULL;
    apiClient_unsetupGlobalEnv();

Multi-threaded Usage

If the C client library is used in multi-threaded program, the following 2 actions are required:

1. After the program starts up, main thread must call the function apiClient_setupGlobalEnv() before any worker thread is created.

2. If the C client is no longer used, main thread must call the function apiClient_unsetupGlobalEnv() after all worker threads end.

Refer to the example for detail.

Documentation

All APIs and Models' documentation can be found at the Generated client's README file

Community, discussion, contribution, and support

Learn how to engage with the Kubernetes community on the community page.

You can reach the maintainers of this project at:

• Slack
• Mailing List

Code of conduct

Participation in the Kubernetes community is governed by the Kubernetes Code of Conduct.