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Caleb Lemoine edited this page Apr 25, 2019 · 37 revisions

Command line arguments can be viewed by running:

docker run --rm pyouroboros/ouroboros --help

All command line arguments can be substituted with an environment variable. command line options are kebab-case and environment variables are SCREAMING_CASE. E.g. --docker-sockets vs. DOCKER_SOCKETS. All examples will be given as environment variables for a docker run as --help will show command line examples



Help

Type: Boolean - Interrupting
Command Line: -h, --help

Shows the help message then exits

Core

Version

Type: Boolean - Interrupting
Command Line: -v, --version

Shows the current version number then exits

Docker Sockets

Type: List - Space separated
Command Line: -d, --docker-sockets
Environment Variable: DOCKER_SOCKETS
Default: unix://var/run/docker.sock
Example: -e DOCKER_SOCKETS="unix://var/run/docker.sock tcp://192.168.1.100:2376"

Allows you to define a list of docker sockets. If defined, it does not include the local socket by default.

Docker TLS

Type: Boolean
Command Line: -t, --docker-tls
Environment Variable: DOCKER_TLS
Default: False
Example: -e DOCKER_TLS=true

Enables docker TLS secure client connections by certificate

Example cert structure:

   /etc/docker/certs.d/         <-- Certificate directory
    └── localhost:5000          <-- socket as defined in config after //
       ├── client.cert          <-- Client certificate
       ├── client.key           <-- Client key
       └── ca.crt               <-- CA certificate

and would be mounted something like

-v /etc/docker/certs.d:/etc/docker/certs.d

Docker TLS Verify

Type: Boolean
Command Line: -T, --docker-tls-verify
Environment Variable: DOCKER_TLS_VERIFY
Default: False
Example: -e DOCKER_TLS_VERIFY=true

Enables verifying docker TLS secure client connections by certificate

Interval

Type: Integer
Command Line: -i, --interval
Environment Variable: INTERVAL Default: 300
Example: -e INTERVAL=300

The interval in seconds between checking for updates. There is a hard-coded 30 second minimum. Anything lower than that will set to 30.

Cron

Type: String
Command Line: -C, --cron
Environment Variable: CRON
Default: None
Example: -e CRON="*/5 * * * *"

The schedule defined when to check for updates. If not defined, runs at interval.

Log Level

Type: String - Choice
Command Line: -l, --log-level
Environment Variable: LOG_LEVEL
Choices:

  • debug
  • info
  • warn
  • error
  • critical

Default: info
Example: -e LOG_LEVEL=info

Sets your logging verbosity level.

Self Update

Type: Boolean
Command Line: -u, --self-update
Environment Variable: SELF_UPDATE
Default: False
Example: -e SELF_UPDATE=true

Let ouroboros update itself in addition to your other containers. Self updates require the the container to be named either ouroboros or ouroboros-updated and will alternate the former names for updates. Self updates will wipe update counters for notifications.

Run Once

Type: Boolean - Interrupting
Command Line: -o, --run-once
Environment Variable: RUN_ONCE
Default: False

Ouroboros will only do a single pass of all container checks, and then exit. This is a great way to granularly control scheduling with an outside scheduler like cron. If during the single pass ouroboros has to self-update, it will do another full pass after updating itself to ensure that all containers were checked.

Dry Run

Type: Boolean
Command Line: -A, --dry-run Environment Variable: DRY_RUN
Default: False

Ouroboros will only simulate container updates, but will not perform the actions. Best for testing configurations, seeing what updates would be applied. Best used with run-once.

Docker Specifics

Monitor

Type: List - Space separated
Command Line: -m, --monitor
Environment Variable: MONITOR
Default: All
Example: -e MONITOR="nginx telegraf portainer"

Define a list of containers you would like to monitor instead of all containers. If defined, labels then ignore take precedence. If a container is listed that does not match the name of currently running containers, it will be ignored.

Ignore

Type: List - Space separated
Command Line: -n, --ignore
Environment Variable: IGNORE
Default: None
Example: -e IGNORE="mariadb influxdb mongo postgres"

Define a list of containers you would like to ignore updates for. If a container is listed that does not match the name of currently running containers, it will be ignored.

Label Enable

Type: Boolean
Command Line: -k, --label-enable
Environment Variable: LABEL_ENABLE
Default: False
Example: -e LABEL_ENABLE=true

If a container has a com.ouroboros.enable label, only watch it if it is set to true. Supersedes monitor/ignore in precedence. This can be achieved by setting LABEL com.ouroboros.enable="false" in your Dockerfile or passing the label during creation of the container with docker run -d --label=com.ouroboros.enable="false" person/image:tag. See Labels for a list of all available labels.

Labels Only

Type: Boolean
Command Line: -m, --labels-only
Environment Variable: LABELS_ONLY
Default: False
Example: -m LABELS_ONLY=true

This flag allows a more strict control over ouroboros's updates. If the container does not have a com.ouroboros.enable label, it will be ignored completely. If label_enable is not true, this option is ignored. See Labels for a list of all available labels.

Cleanup

Type: Boolean
Command Line: -c, --cleanup
Environment Variable: CLEANUP
Default: False
Example: -e CLEANUP=true

Remove the old images after updating. If you have multiple containers using the same image, it will ensure all containers are updated before successfully removing the image.

Latest

Type: Boolean
Command Line: -L, --latest
Environment Variable: LATEST
Default: False
Example: -e LATEST=true

Pull the :latest tags and update all containers to it, regardless of the current tag the container is running as.

Repository User

Type: String
Command Line: -r, --repo-user
Environment Variable: REPO_USER
Default: None
Example: -e REPO_USER=johndoe1970

Define a username for repository authentication. Will be ignored without defining a repository password.

Repository Password

Type: String
Command Line: -R, --repo-pass
Environment Variable: REPO_PASS
Default: None
Example: -e REPO_PASS=0791eodnhoj

Define a password for repository authentication. Will be ignored without defining a repository username.

Data Export Options

Data Export

Type: String - Choice
Command Line: -D, --data-export
Environment Variable: DATA_EXPORT
Choices:

  • prometheus
  • influxdb

Example: -e DATA_EXPORT=influxdb

Enables exporting metric data to your chosen application. If you choose Prometheus, and self update, host port bindings will not persist. It is recommended to reverse proxy your exporter through nginx. If you choose influxdb, you must set influx database at minimum.

Prometheus

Full Example:

-e PROMETHEUS_ADDR=0.0.0.0 \
-e PROMETHEUS_PORT=3579  

See Prometheus Metrics for more insight

Prometheus Address

Type: String
Command Line: -a, --prometheus-addr
Environment Variable: PROMETHEUS_ADDR
Default: 127.0.0.1
Example: -e PROMETHEUS_ADDR=0.0.0.0

Bind address for prometheus exporter to attach to.

Prometheus Port

Type: Integer
Command Line: -p, --prometheus-port
Environment Variable: PROMETHEUS_PORT
Default: 8000
Example: -e PROMETHEUS_PORT=3579

Bind port for prometheus exporter to attach to.

Influxdb

Full Example:

-e INFLUX_URL=influx.domain.tld \
-e INFLUX_PORT=443 \
-e INFLUX_USERNAME=ouroboros \
-e INFLUX_PASSWORD=soroboruo \
-e INFLUX_DATABASE=ouroboros \
-e INFLUX_SSL=true \
-e INFLUX_VERIFY_SSL=true

Influx URL

Type: String
Command Line: -I, --influx-url
Environment Variable: INFLUX_URL
Default: 127.0.0.1
Example: -e INFLUX_URL=192.168.1.100

URL influxdb is listening on

Influx Port

Type: Integer
Command Line: -P, --influx-port
Environment Variable: INFLUX_PORT
Default: 8086
Example: -e INFLUX_PORT=8123

Port influxdb is listening on

Influx Username

Type: String
Command Line: -U, --influx-username
Environment Variable: INFLUX_USERNAME
Default: root
Example: -e INFLUX_USERNAME=ouroboros

Username to authenticate to influx with.

Influx Password

Type: String
Command Line: -x, --influx-password
Environment Variable: INFLUX_PASSWORD
Default: root
Example: -e INFLUX_PASSWORD=soroboruo

Password to authenticate to influx with.

Influx Database

Type: String
Command Line: -X, --influx-database
Environment Variable: INFLUX_DATABASE
Default: None
Example: -e INFLUX_DATABASE=ouroboros

Database to save data points to. Not set and required if using influxdb.

Influx SSL

Type: Boolean
Command Line: -s, --influx-ssl
Environment Variable: INFLUX_SSL
Default: None
Example: -e INFLUX_SSL=true

Use SSL when connecting to influxdb. (mainly used when influxdb is behind an https reverse proxy)

Influx Verify SSL

Type: Boolean
Command Line: -V, --influx-verify-ssl
Environment Variable: INFLUX_VERIFY_SSL
Default: False
Example: -e INFLUX_VERIFY_SSL=true

Verify the ssl certificate used when connecting to influxdb. only used in conjunction with influx ssl

Notifications

Type: List - Space separated
Command Line: -N, --notifiers
Environment Variable: NOTIFIERS
Default: None
Example: -n NOTIFIERS="mailtos://myUsername:myPassword@gmail.com?to=receivingAddress@gmail.com jsons://webhook.site/something"

Ouroboros uses apprise to support a large variety of notification platforms.

Notifications are sent per socket, per run. The notification contains the socket, the containers updated since last start, and a list of containers updated this pass with from/to SHA.

More information can be found in the notifications wiki.

Skip Startup Notifications

Type: Boolean
Command Line: --skip-startup-notifications
Environment Variable: SKIP_STARTUP_NOTIFICATIONS
Default: False
Example: --skip-startup-notifications

Doesn't send startup notifications if arg is passed.

Labels

  • com.ouroboros.enable

    Example: com.ouroboros.enable=true
    Used for Label Enable

  • com.ouroboros.depends_on

    Example: com.ouroboros.depends_on=postgres,redis To simulate docker-compose depends_on functionality. If defined on any containers (by container name), all referenced containers will be turned off before the update process and then turned back on after the update process.

  • com.ouroboros.hard_depends_on

    Example: com.ouroboros.hard_depends_on=postgres,redis
    Same as above with the exception that it will recreate the container instead of just turning it off/ton

  • com.ouroboros.stop_signal

    Example: com.ouroboros.stop_signal=SIGKILL
    Define a stop signal to send to the container instead of SIGKILL. Can be string or int.

Examples

Configuration

.env File

You can provide a docker env file to supplement a config file with all the above listed arguments by utilizing the supported environment variables.

docker run -d --name ouroboros \
  --env-file ouroboros.env \
  -v /var/run/docker.sock:/var/run/docker.sock \
  pyouroboros/ouroboros

Sample ouroboros.env:

DOCKER_SOCKETS=tcp://localhost:2375
INTERVAL=60
MONITOR="container_1 container_2"

Scenarios

Prometheus metrics

Ouroboros keeps track of containers being updated and how many are being monitored. Said metrics are exported using prometheus. You can also bind the http server to a different interface for systems using multiple networks. --prometheus-port and --prometheus-addr can run independently of each other without issue.

Prometheus exporter will not be reachable by default inside of a container. You will need to intentionally bind to 0.0.0.0 for docker network interfaces to be able to reach the exporter the host network. This was done intentionally for security reasons.

Bind Address & Port

Bind Address default is 127.0.0.1

Port Default is 8000

docker run -d --name ouroboros \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -p 8000:8000 pyouroboros/ouroboros --data-export prometheus --prometheus-addr 0.0.0.0

You should then be able to see the metrics at http://localhost:8000/

Example text from endpoint:

# HELP containers_updated_total Count of containers updated
# TYPE containers_updated_total counter
containers_updated_total{container="all"} 2.0
containers_updated_total{container="alpine"} 1.0
containers_updated_total{container="busybox"} 1.0
# TYPE containers_updated_created gauge
containers_updated_created{container="all"} 1542152615.625264
containers_updated_created{container="alpine"} 1542152615.6252713
containers_updated_created{container="busybox"} 1542152627.7476819
# HELP containers_being_monitored Count of containers being monitored
# TYPE containers_being_monitored gauge
containers_being_monitored 2.0
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