April 2018
Intermediate to advanced
468 pages
14h 34m
English
Content preview from Mastering Kubernetes - Second Edition
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The custom seed provider
When running Cassandra nodes as pods in Kubernetes, Kubernetes may move pods around, including seeds. To accommodate that, a Cassandra seed provider needs to interact with the Kubernetes API server.
Here is a short snippet from the custom KubernetesSeedProvider Java class that implements the Cassandra SeedProvider API:
public class KubernetesSeedProvider implements SeedProvider { ... /** * Call kubernetes API to collect a list of seed providers * @return list of seed providers */ public List<InetAddress> getSeeds() { String host = getEnvOrDefault("KUBERNETES_PORT_443_TCP_ADDR", "kubernetes.default.svc.cluster.local"); String port = getEnvOrDefault("KUBERNETES_PORT_443_TCP_PORT", "443"); String serviceName = getEnvOrDefault("CASSANDRA_SERVICE", ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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