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Writing Tools in Go
For Ops Engineers
Go 1.6 Release Party
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@y_uuk1
id:y_uuki
Web Operations Engineer
@Hatena
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About 2.5 years
since I met Go
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My ops tools in Go
• yuuki1/droot
• yuuki1/grabeni
• yuuki1/gokc
• mackerelio/mkr
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Ready for
production use
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mkr
Command Line Tool for Mackerel API
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mkr
• For programable server operations
with Mackerel
• JSON output (Enable to parse with jq)
• Depends on mackerelio/mackerel-
client-go
• More useful on server (No need to
pass an API Key)
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Grabeni
An ops-friendly AWS Elastic Network
Interface (ENI) attachment grabbing tool.
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Grabeni
• Help a failover tool (Keepalived/
MHA) switch a VIP
• Depends on aws/aws-sdk-go
• AWS API Retry/Max Attempts
HSBCFOJHSBCFOJYYYYYYYYY
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Droot
A super-easy application container engine
with chroot without docker.
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IUUQZVVLJIBUFOBCMPHDPNFOUSZESPPU
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Droot
• chroot an extracted archive from
Docker images
• Pull an archive from AWS S3
• Atomic deploy with symlink and
rename(2)
• `docker export | s3 upload` by
io.Pipe()
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gokc
Yet Another Keepalived Syntax Checker in
Golang.
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IUUQZVVLJIBUFOBCMPHDPNFOUSZHPLD
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gokc
• Keepalived (well known with LVS)
• Replace maoe/kc written in Haskell
(Parser combinator)
• Parser with yacc
• Lexer with goroutine and channel
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I believe
Go is a good solution
for ops engineers
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Pros of Golang
for ops engineer
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1
Easy Distribution
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Easy Distribution
• One Binary
• Escaping Dependency Problem
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Why is “One binary”
so important ?
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• 1500+α Hosts
• 500+α Roles
• Services continued 15 years
• Many Old OSs …
Hatena
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2
Quick development
on Server
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Quick Development on Server
• GOOS=linux GOARCH=amd64 (or
build on Docker)
• scp ./binary [remote server]
• ./binary
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Quick Development on Server
• One binary & Cross compile
• My ops tools aim to run on Linux
servers.
• ex. droot runs on Linux only
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3
Quick deployment
as a result
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• Not mean that coding is just quick
• Mean that no hesitation about
coding because Go has the simple
language specification
Quick deployment
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Others
• Concurrency by goroutine
• `io.Pipe()`
• Fast runtime rather than LL
• Error handing by returning error type
• `defer` statement
• Easy to clear temp resources on failure
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Summary
• Pros of Go for ops engineers
• Easy binary distribution
• Quick development on server
• Quick deployment as a result