51 lines
2.4 KiB
Markdown
51 lines
2.4 KiB
Markdown
---
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description: Identify active machines
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keywords: machine, driver, base, operating system
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title: Driver options and operating system defaults
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---
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When Docker Machine provisions containers on local network provider or with a
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remote, cloud provider such as Amazon Web Services, you must define both the
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driver for your provider and a base operating system. There are over 10
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supported drivers and a generic driver for adding machines for other providers.
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Each driver has a set of options specific to that provider. These options
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provide information to machine such as connection credentials, ports, and so
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forth. For example, to create an Azure machine:
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Grab your subscription ID from the portal, then run `docker-machine create` with
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these details:
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```bash
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$ docker-machine create -d azure --azure-subscription-id="SUB_ID" --azure-subscription-cert="mycert.pem" A-VERY-UNIQUE-NAME
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```
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To see a list of providers and review the options available to a provider, see
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the reference for that driver.
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In addition to the provider, you have the option of identifying a base operating
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system. It is an option because Docker Machine has defaults for both local and
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remote providers. For local providers such as VirtualBox, Fusion, Hyper-V, and
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so forth, the default base operating system is Boot2Docker. For cloud providers,
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the base operating system is the latest Ubuntu LTS the provider supports.
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| Operating System | Version | Notes |
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| ----------------------- | ------- | ------------------ |
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| Boot2Docker | 1.5+ | default for local |
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| Ubuntu | 12.04+ | default for remote |
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| RancherOS | 0.3+ | |
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| Debian | 8.0+ | experimental |
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| RedHat Enterprise Linux | 7.0+ | experimental |
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| CentOS | 7+ | experimental |
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| Fedora | 21+ | experimental |
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To use a different base operating system on a remote provider, specify the
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provider's image flag and one of its available images. For example, to select a
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`debian-8-x64` image on DigitalOcean you would supply the
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`--digitalocean-image=debian-8-x64` flag.
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If you change the parent image for a provider, you may also need to change
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the SSH user. For example, the default Red Hat AMI on EC2 expects the
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SSH user to be `ec2-user`, so you need to specify this with
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`--amazonec2-ssh-user ec2-user`.
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