红帽全球峰会10.3. Data storage management
The following table summarizes the main directories that OpenShift Container Platform components write data to.
| Directory | Notes | Sizing | Expected growth |
|---|---|---|---|
| /var/log | Log files for all components. | 10 to 30 GB. | Log files can grow quickly; size can be managed by growing disks or by using log rotate. |
| /var/lib/etcd | Used for etcd storage when storing the database. | Less than 20 GB. Database can grow up to 8 GB. | Will grow slowly with the environment. Only storing metadata. Additional 20-25 GB for every additional 8 GB of memory. |
| /var/lib/containers | This is the mount point for the CRI-O runtime. Storage used for active container runtimes, including pods, and storage of local images. Not used for registry storage. | 50 GB for a node with 16 GB memory. Note that this sizing should not be used to determine minimum cluster requirements. Additional 20-25 GB for every additional 8 GB of memory. | Growth is limited by capacity for running containers. |
| /var/lib/kubelet | Ephemeral volume storage for pods. This includes anything external that is mounted into a container at runtime. Includes environment variables, kube secrets, and data volumes not backed by persistent volumes. | Varies | Minimal if pods requiring storage are using persistent volumes. If using ephemeral storage, this can grow quickly. |
