# Fast Arista cEOS Container Configuration

DevFeed: [Fast Arista cEOS Container Configuration](<https://devfeed.tech/articles/fast-arista-ceos-container-configuration-11332.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2026/02/netlab-eos-configuration/>)

Published: 2026-02-09T06:23:00Z

Content type: article

Language: en

Sources: [ipSpace.net blog](<https://devfeed.tech/sources/ipspace-net-blog.md>)

Topics: [Containers](<https://devfeed.tech/topics/containers.md>), [Command-line interface](<https://devfeed.tech/topics/cli.md>), [Ansible](<https://devfeed.tech/topics/ansible.md>)

Tags: [ansible](<https://devfeed.tech/tags/ansible.md>), [cli](<https://devfeed.tech/tags/cli.md>), [container](<https://devfeed.tech/tags/container.md>), [containers](<https://devfeed.tech/tags/containers.md>), [net-11](<https://devfeed.tech/tags/net-11.md>), [netlab](<https://devfeed.tech/tags/netlab.md>)

## AI overview

The article explains how to configure Arista cEOS containers by executing netlab-generated EOS configuration snippets through FastCli. It describes wrapper requirements, Ansible template and error-handling issues, and a startup timing problem addressed in netlab release 26.02 by waiting for SSH availability and enabling shell configuration mode.

## Source excerpt

After the enormous speedup I achieved with the FRR containers, I tried to do something similar with the Arista cEOS ones. After all, Arista's pretty open about running its software on standard Linux, so it should be possible to map host-side configuration files into container-side scripts and execute them, right? There was just one tiny gotcha: all netlab-generated EOS configuration files are device configuration snippets that are intended to be submitted via EOS CLI, and I didn't feel like cracking open the netmiko documentation (that's another backburner project). However, Arista cEOS includes this magic command called FastCli ;) Read more ...