Citing concerns around Docker’s security model and its increasingly complex supporting platform, CoreOS is developing Rocket, an alternative to the open-source container technology.

“A little bit of competition is good for the user at the end of the day. It makes sure everyone is aligned on building really good products,” said Alex Polvi, CoreOS CEO.

The Rocket container runtime, released Monday, addresses a number of concerns that the Linux distributor had around Docker.

CoreOS, which produces a popular Linux distribution configured for use in the cloud, has been an early and strong supporter of Docker. The company started working on its own alternative because of the increasing number of issues its customers were experiencing with the virtualization technology, Polvi said.

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