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 installBuilding an example
cd ${CLIENT_REPO_ROOT}/examples/list_pod
makeRunning the example
./list_pod_binUsage 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:
-
After the program starts up, main thread must call the function
apiClient_setupGlobalEnv()before any worker thread is created. -
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.
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:
Code of conduct
Participation in the Kubernetes community is governed by the Kubernetes Code of Conduct.
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