Contents：
Background
Alluxio provides a unified namespace mechanism that allows other file systems to be mounted to the file system of Alluxio.
In addition, it allows upper-layer applications to use the unified namespace to access data scattered across different systems.
Operation
Command: bin/alluxio fs mount <alluxio-path> <source-path>
Example 1. Mount a COS bucket to an Alluxio directory.
bin/alluxio fs mount --option fs.cos.access.key=<COS_SECRET_ID> \
--option fs.cos.secret.key=<COS_SECRET_KEY> \
--option fs.cos.region=<COS_REGION> \
--option fs.cos.app.id=<COS_APP_ID> \
/cos cos://<COS_BUCKET>/<COS_DATA>/Configure the COS configuration information in --options.
| Configuration Item | Description |
|---|---|
| fs.cos.access.key | COS scecretId |
| fs.cos.secret.key | COS secretKey |
| fs.cos.region | COS region name such as ap-beijing |
| fs.cos.app.id | User APPID |
| COS_BUCKET | COS Bucket name |
| COS_DATA | COS directory, which can be the root / |
This command mounts the COS directory (specified by cos://bucket/xxx) to the /cos directory in Alluxio.
Example 2. Mount an HDFS directory to an Alluxio directory.
bin/alluxio fs mount /hdfs hdfs://data
This command mounts the /data directory of HDFS to the /hdfs subdirectory of Alluxio.
After the mount is successful, the mounted content can be viewed by running the alluxio fs ls command.
