Multiplexing SSH Connections with Control Master: Speed Up Deployments and Automation
📰 Dev.to AI
Speed up SSH deployments and automation by reusing connections with Control Master, reducing the overhead of repeated cryptographic handshakes
Action Steps
- Configure SSH to use Control Master by adding 'ControlMaster auto' and 'ControlPersist 4h' to your SSH config file
- Enable multiplexing by setting 'ControlPath ~/.ssh/ctl-%r@%h:%p' in your SSH config
- Test the setup by running multiple SSH commands in quick succession to verify connection reuse
- Use tools like Ansible to automate deployments and take advantage of the multiplexed connections
- Monitor the performance improvement by measuring the time taken for deployments and automation tasks before and after implementing Control Master
Who Needs to Know This
DevOps teams and system administrators can benefit from this technique to improve the efficiency of their automation scripts and deployments
Key Insight
💡 Reusing SSH connections with Control Master can significantly reduce the overhead of repeated cryptographic handshakes, leading to faster deployments and automation
Share This
💡 Speed up SSH deployments with Control Master! Reduce handshake overhead and reuse connections for faster automation
Key Takeaways
Speed up SSH deployments and automation by reusing connections with Control Master, reducing the overhead of repeated cryptographic handshakes
Full Article
Every SSH command you run opens a fresh TCP connection and completes a full cryptographic handshake. Here's how to do it once and reuse it hundreds of times. If you run ansible against 50 servers, each task opens a new SSH connection. If you have 10 tasks per server, that's 500 handshakes. If you run rsync frequently to a remote dev server, you're paying the connection cost every time. If your deployment script calls ssh in a loop, you're payi
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