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Using Memcache for Session Storage in Legacy Symfony / Projects
Using Memcache for Session Storage in Legacy Symfony / Projects
Dec 28, 2024 am 08:48 AM
Introduction
If you're maintaining a legacy Symfony 1.4/1.5 project and need to implement session storage with Memcache, this guide will help you get it up and running properly.
Prerequisites
- Symfony 1.4/1.5 project
- Docker environment
- PHP 7.4 (recommended for legacy Symfony)
- Memcached server
Step 1: Configure Your PHP Container
First, you'll need to install the Memcache extension in your PHP container:
# Install memcache extension (note: memcache, not memcached)
RUN apt-get update && apt-get install -y
libmemcached-dev
&& pecl install memcache-4.0.5.2
&& docker-php-ext-enable memcache
Note: We specifically use memcache-4.0.5.2 as it's compatible with PHP 7.4.
Step 3: Verify Your Setup
You can verify your Memcache session storage is working by connecting to your Memcached container and running some diagnostic commands:
`# Connect to your memcached container
docker exec -it your_memcached_container bash
Check general stats
echo "stats" | nc localhost 11211
Check session items
echo "stats items" | nc localhost 11211
View specific slab contents (replace X with slab ID from stats items)
echo "stats cachedump X 100" | nc localhost 11211`
Key Statistics to Watch
When checking your Memcache stats, pay attention to:
- curr_items: Current number of items stored
- get_hits/get_misses: Success rate of session retrievals
- bytes: Memory usage
- evictions: Should be 0 unless under memory pressure
Common Issues and Solutions
Class Not Found Errors
If you see Class 'sfMemcacheCache' not found, ensure:
Memcache extension is properly installed
Your cache is cleared (php symfony cc)Connection Issues
If sessions aren't persisting, verify:
Memcached host is correctly specified
Port 11211 is accessible
Persistent connections are enabledPerformance Optimization
For better performance:
Use IGBINARY serializer
Enable persistent connections
Set appropriate prefix to avoid collisions
Use compiled mode
Conclusion
Using Memcache for session storage in legacy Symfony projects can significantly improve performance and scalability. The configuration shown above provides a robust solution that works well with Symfony 1.4/1.5's architecture.
Remember to:
Use the correct Memcache extension version
Configure appropriate session lifetimes
Monitor memory usage
Set meaningful prefixes for multi-app environments
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