Add DNS caching control feature for testing DNS failover scenarios #13
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This commit adds the DNS_CACHE_ENABLED environment variable to control DNS caching behavior during load tests. By default (false), DNS caching is disabled to ensure immediate detection of backend DNS changes. Changes: - Add DNS_CACHE_ENABLED configuration (default: false) - When disabled, connection pooling is turned off to force DNS lookups on each request (pool_max_idle_per_host=0, pool_idle_timeout=0) - When enabled, normal connection pooling and DNS caching apply - Add startup logging to show DNS cache status - Document DNS_CACHE_ENABLED in README with usage examples - Add detailed "DNS Caching Behavior" section explaining trade-offs This feature is critical for testing: - Blue/green deployments with DNS switchovers - Failover scenarios with DNS redirection - Any situation where backend IPs change during a test Trade-offs: - Disabled (default): Higher DNS load, TCP overhead, but immediate DNS change detection - Enabled: Better performance, but may miss DNS changes during test Resolves #12 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit adds 'apt-get upgrade -y' to the runtime image build process to ensure all Ubuntu base packages are updated to their latest patched versions. Fixes the following CVEs: - CVE-2024-41996 (openssl) - N/A severity - CVE-2025-45582 (tar) - N/A severity - CVE-2025-8941 (pam) - N/A severity - CVE-2024-56433 (shadow) - N/A severity - CVE-2024-2236 (libgcrypt20) - N/A severity - CVE-2022-3219 (gnupg2) - 3.3 severity Note: CVE-2016-2781 (coreutils, 6.5 severity) from 2016 is marked as "won't fix" by Ubuntu and has low exploitability in container contexts. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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This commit adds the DNS_CACHE_ENABLED environment variable to control DNS caching behavior during load tests. By default (false), DNS caching is disabled to ensure immediate detection of backend DNS changes.
Changes:
This feature is critical for testing:
Trade-offs:
Resolves #12
🤖 Generated with Claude Code