[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["わかりにくい","hardToUnderstand","thumb-down"],["情報またはサンプルコードが不正確","incorrectInformationOrSampleCode","thumb-down"],["必要な情報 / サンプルがない","missingTheInformationSamplesINeed","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-09-04 UTC。"],[[["\u003cp\u003eContainer-Optimized OS uses a file system layout with read-only root, stateful, and stateless partitions to enhance node security.\u003c/p\u003e\n"],["\u003cp\u003eThe root file system is read-only to protect system integrity, but home directories and \u003ccode\u003e/mnt/stateful_partition\u003c/code\u003e are writable and persistent.\u003c/p\u003e\n"],["\u003cp\u003eSpecific paths like \u003ccode\u003e/var/lib/google\u003c/code\u003e, \u003ccode\u003e/var/lib/docker\u003c/code\u003e, and \u003ccode\u003e/var/lib/toolbox\u003c/code\u003e are designated for working directories of certain services, and are stateful.\u003c/p\u003e\n"],["\u003cp\u003ePersistent disks can be attached and mounted under \u003ccode\u003e/mnt/disks\u003c/code\u003e using \u003ccode\u003ecloud-config\u003c/code\u003e scripts, as the \u003ccode\u003e/etc/fstab\u003c/code\u003e method is not available due to the stateless nature of \u003ccode\u003e/etc/\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eYou can use \u003ccode\u003ecloud-init\u003c/code\u003e to handle configuration and mounting of disks on Container-Optimized OS instances, ensuring that configurations are applied on creation and restarts.\u003c/p\u003e\n"]]],[],null,["# Disks and file system overview\n\nThis page provides an overview of the Container-Optimized OS file system\nand describes how to mount and format disks.\n\nFile system\n-----------\n\nThe Container-Optimized OS node image file system layout is optimized to\nenhance node security. The boot disk space is split into three types of\npartitions:\n\n- **Root partition**, which is mounted as read-only.\n- **Stateful partitions**, which are writable and stateful.\n- **Stateless partitions**, which are writable but the contents do not persist across reboots.\n\nWhen using Container-Optimized OS, be aware of the partitioning if you run\nyour own services that have certain expectations about the file system layout\noutside of containers.\n\nThe root file system is mounted as read-only to protect system integrity.\nHowever, home directories and `/mnt/stateful_partition` are persistent and\nwritable.\n\n### Working with the Container-Optimized OS file system\n\n\nThe following is a list of paths in the Container-Optimized OS node image file\nsystem, along with their properties and recommended usage:\n\nMounting and formatting disks\n-----------------------------\n\nYou can attach a persistent disk or create an instance with Local SSDs when using\nContainer-Optimized OS. Follow the instructions on [Formatting and mounting\na persistent disk](/compute/docs/disks/format-mount-disk-linux#format_linux) or\n[Format and mount a local SSD device](/compute/docs/disks/add-local-ssd#formatandmount)\nfor the appropriate use-case.\n\nThe disks can be mounted by creating a subdirectory under `/mnt/disks`\ndirectory. Since `/etc/` is stateless on Container-Optimized OS, you\ncannot use `/etc/fstab` to automatically fsck (file system consistency check)\nand mount the disks on boot. But you can achieve the same by doing those\noperations from the `bootcmd` section in your\n[`cloud-config`](http://cloudinit.readthedocs.io/en/latest/topics/examples.html).\n\nThe following example mounts the disk \u003cvar translate=\"no\"\u003eDEVICE_ID\u003c/var\u003e\nunder the `/mnt/disks` directory.\n\n1. Create a script file using the following contents:\n\n #cloud-config\n\n bootcmd:\n - fsck.ext4 -tvy /dev/\u003cvar translate=\"no\"\u003eDEVICE_ID\u003c/var\u003e\n - mkdir -p /mnt/disks/\u003cvar translate=\"no\"\u003eMNT_DIR\u003c/var\u003e\n - mount -t ext4 -o ... /dev/\u003cvar translate=\"no\"\u003eDEVICE_ID\u003c/var\u003e /mnt/disks/\u003cvar translate=\"no\"\u003eMNT_DIR\u003c/var\u003e\n\n Replace the following:\n - \u003cvar translate=\"no\"\u003eDEVICE_ID\u003c/var\u003e: the device ID of the disk that you want to format and mount.\n - \u003cvar translate=\"no\"\u003eMNT_DIR\u003c/var\u003e: the directory in which to mount your disk.\n\n Refer to the Linux documentation for a full set of options\n supported by the [`fsck.ext4`](http://man7.org/linux/man-pages/man8/e2fsck.8.html)\n and [`mount`](http://man7.org/linux/man-pages/man8/mount.8.html) commands.\n2. Update the VM metadata to include the script file by using the\n `--metadata-from-file` flag.\n\n To create a VM, use the following command: \n\n gcloud compute instances create \u003cvar translate=\"no\"\u003eINSTANCE_NAME\u003c/var\u003e \\\n --metadata-from-file user-data=\u003cvar translate=\"no\"\u003eSCRIPT_FILE_NAME\u003c/var\u003e\n\n To update an existing instance, use the following command: \n\n gcloud compute instances add-metadata \u003cvar translate=\"no\"\u003eINSTANCE_NAME\u003c/var\u003e \\\n --metadata-from-file user-data=\u003cvar translate=\"no\"\u003eSCRIPT_FILE_NAME\u003c/var\u003e\n\n Replace the following:\n - \u003cvar translate=\"no\"\u003eINSTANCE_NAME\u003c/var\u003e: the name of your VM instance.\n - \u003cvar translate=\"no\"\u003eSCRIPT_FILE_NAME\u003c/var\u003e: the name of the metadata script file."]]
