Description:
Let's Encrypt client and ACME library
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Type: Formula
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Tracked Since: Dec 16, 2025
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Links:
Homepage |
formulae.brew.sh
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Category: Security
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Tags:
tls
ssl
letsencrypt
acme
security
devops
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Install:
brew install lego
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About:
Lego is a command-line tool and ACME client library written in Go that automates the process of obtaining SSL/TLS certificates from Let's Encrypt and other ACME-compatible certificate authorities. It can automatically solve challenges using a wide variety of DNS providers and load balancers. Its primary value is enabling developers and DevOps engineers to secure web services with minimal manual intervention.
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Key Features:
- Supports over 100 DNS providers for automated DNS-01 challenges
- Can be used as a CLI tool or integrated as a Go library
- Supports wildcard certificates and ECDSA keys
- Renewals can be managed via cron or systemd timers
- Compatible with Let's Encrypt and other ACME CAs
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Use Cases:
- Automating TLS certificate issuance for web servers and reverse proxies
- Securing internal services with wildcard certificates via DNS challenges
- Integrating certificate management into CI/CD pipelines and infrastructure-as-code workflows
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Alternatives:
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certbot
– Certbot is Python-based and tightly integrated with Apache/Nginx, while Lego is a Go binary with broader DNS provider support and is often easier to integrate into custom workflows.
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acme.sh
– acme.sh is a lightweight POSIX shell script; Lego offers similar functionality with a statically compiled binary and a robust Go library for programmatic use.
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| Dec 16, 2025 11:07pm |
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