9 KiB
The behavior of zot registry is controlled via its configuration file, which can either be a JSON (used in details below) or YAML file.
zot serve <config-file>
A candidate configuration file can be verified via:
zot verify <config-file>
Examples of working configurations for various use cases are available here
Configuration Parameters
Network
Configure network params with:
"http": {
Configure address and port to listen on with:
"address": "127.0.0.1",
"port": "5000",
Additionally, TLS configuration can be specified with:
"tls": {
"cert":"test/data/server.cert",
"key":"test/data/server.key"
},
The registry can be deployed as a read-only service with:
"ReadOnly": false
},
Storage
Configure storage with:
"storage": {
Configure storage root directory with:
"rootDirectory": "/tmp/zot",
Often, container images have shared layers and blobs and for filesystems that support hard links, inline deduplication can be enabled with:
"dedupe": true,
When an image is deleted (either by tag or reference), orphaned blobs can lead to wasted storage, and background garbage collection can be enabled with:
"gc": true,
It is also possible to store and serve images from multiple filesystems with their own repository paths, dedupe and garbage collection settings with:
"subPaths": {
"/a": {
"rootDirectory": "/tmp/zot1",
"dedupe": true,
"gc": true
},
"/b": {
"rootDirectory": "/tmp/zot2",
"dedupe": true
},
"/c": {
"rootDirectory": "/tmp/zot3",
"dedupe": false
}
}
},
Authentication
TLS mutual authentication and passphrase-based authentication are supported.
TLS Mutual Authentication
Apart from the server cert and key specified under network configuration, specifying the cacert field enables TLS mutual authentication:
"http": {
"tls": {
"cert":"test/data/server.cert",
"key":"test/data/server.key",
"cacert":"test/data/cacert.cert"
},
Passphrase Authentication
Local authentication is supported via htpasswd file with:
"http": {
"auth": {
"htpasswd": {
"path": "test/data/htpasswd"
},
LDAP authentication can be configured with:
"http": {
"auth": {
"ldap": {
"address":"ldap.example.org",
"port":389,
"startTLS":false,
"baseDN":"ou=Users,dc=example,dc=org",
"userAttribute":"uid",
"bindDN":"cn=ldap-searcher,ou=Users,dc=example,dc=org",
"bindPassword":"ldap-searcher-password",
"skipVerify":false,
"subtreeSearch":true
},
NOTE: When both htpasswd and LDAP configuration are specified, LDAP authentication is given preference.
OAuth2 authentication (client credentials grant type) support via Bearer Token configured with:
"http": {
"auth": {
"bearer": {
"realm": "https://auth.myreg.io/auth/token",
"service": "myauth",
"cert": "/etc/zot/auth.crt"
}
Authentication Failures
Should authentication fail, to prevent automated attacks, a delayed response can be configured with:
"http": {
"auth": {
"failDelay": 5
Identity-based Authorization
Allowing actions on one or more repository paths can be tied to user identities. An additional per-repository default policy can be specified for identities not in the whitelist. Furthermore, a global admin policy can also be specified which can override per-repository policies.
"accessControl": {
"repos1/repo": {
"policies": [
{
"users": ["alice", "bob"],
"actions": ["create", "read", "update", "delete"]
},
{
"users": ["mallory"],
"actions": ["create", "read"]
}
],
"defaultPolicy": ["read"]
},
"repos2/repo": {
"policies": [
{
"users": ["bob"],
"actions": ["read", "create"]
},
{
"users": ["mallory"],
"actions": ["create", "read"]
}
],
"defaultPolicy": ["read"]
},
"adminPolicy": {
"users": ["admin"],
"actions": ["read", "create", "update", "delete"]
}
}
Logging
Enable and configure logging with:
"log":{
Set log level with:
"level":"debug",
Set output file (default is stdout) with:
"output":"/tmp/zot.log",
Enable audit logs and set output file with:
"audit": "/tmp/zot-audit.log"
}
Metrics
Enable and configure metrics with:
"metrics":{
"enable":"true",
Set server path on which metrics will be exposed:
"prometheus": {
"path": "/metrics"
}
}
In order to test the Metrics feature locally in a Kind cluster, folow this guide.
Storage Drivers
Beside filesystem storage backend, zot also supports S3 storage backend, check below url to see how to configure it:
- s3: A driver storing objects in an Amazon Simple Storage Service (S3) bucket.
For an s3 zot configuration with multiple storage drivers see: s3-config.
zot also supports different storage drivers for each subpath.
Specifying S3 credentials
There are multiple ways to specify S3 credentials:
- Config file:
"storageDriver": {
"name": "s3",
"region": "us-east-2",
"bucket": "zot-storage",
"secure": true,
"skipverify": false,
"accesskey": "<YOUR_ACCESS_KEY_ID>",
"secretkey": "<YOUR_SECRET_ACCESS_KEY>"
}
- Environment variables:
SDK looks for credentials in the following environment variables:
AWS_ACCESS_KEY_ID
AWS_SECRET_ACCESS_KEY
AWS_SESSION_TOKEN (optional)
- Credentials file:
A credential file is a plaintext file that contains your access keys. The file must be on the same machine on which you’re running your application. The file must be named credentials and located in the .aws/ folder in your home directory.
[default]
aws_access_key_id = <YOUR_DEFAULT_ACCESS_KEY_ID>
aws_secret_access_key = <YOUR_DEFAULT_SECRET_ACCESS_KEY>
[test-account]
aws_access_key_id = <YOUR_TEST_ACCESS_KEY_ID>
aws_secret_access_key = <YOUR_TEST_SECRET_ACCESS_KEY>
[prod-account]
; work profile
aws_access_key_id = <YOUR_PROD_ACCESS_KEY_ID>
aws_secret_access_key = <YOUR_PROD_SECRET_ACCESS_KEY>
The [default] heading defines credentials for the default profile, which the SDK will use unless you configure it to use another profile.
To specify a profile use AWS_PROFILE environment variable:
AWS_PROFILE=test-account
For more details see https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/configuring-sdk.html#specifying-credentials
Sync
Enable and configure sync with:
"sync": {
Configure credentials for upstream registries:
"credentialsFile": "./examples/sync-auth-filepath.json",
Configure each registry sync:
"registries": [{
"url": "https://registry1:5000",
"onDemand": false, # pull any image which the local registry doesn't have
"pollInterval": "6h", # polling interval
"tlsVerify": true, # whether or not to verify tls
"certDir": "/home/user/certs", # use certificates at certDir path, if not specified then use the default certs dir
"content":[ # which content to periodically pull
{
"prefix":"/repo1/repo", # pull image repo1/repo
"tags":{ # filter by tags
"regex":"4.*", # filter tags by regex
"semver":true # filter tags by semver compliance
}
},
{
"prefix":"/repo2/repo*" # pull all images that matches repo2/repo.*
},
{
"prefix":"/repo3/**" # pull all images under repo3/ (matches recursively all repos under repo3/)
}
]
},
{
"url": "https://registry2:5000",
"pollInterval": "12h",
"tlsVerify": false,
"onDemand": false,
"content":[
{
"prefix":"/repo2",
"tags":{
"semver":true
}
}
]
},
{
"url": "https://docker.io/library",
"onDemand": true, # doesn't have content, don't periodically pull, pull just on demand.
"tlsVerify": true
}
]
}
Prefixes can be strings that exactly match repositories or they can be glob patterns.