# r630-02 Memory Limit Fix - Complete

**Date:** 2026-01-19  
**Status:** ✅ **COMPLETE**

---

## Executive Summary

All immediate actions from the log review have been resolved. Memory limits for all containers on r630-02 have been increased to appropriate levels to prevent OOM (Out of Memory) kills.

---

## Actions Taken

### 1. ✅ Memory Limits Updated

All 7 containers have had their memory limits increased significantly:

| VMID | Name | Old Limit | New Limit | New Swap | Status |
|------|------|-----------|-----------|----------|--------|
| 5000 | blockscout-1 | 8MB | **2GB** | 1GB | ✅ Updated |
| 6200 | firefly-1 | 4MB | **512MB** | 256MB | ✅ Updated |
| 6201 | firefly-ali-1 | 2MB | **512MB** | 256MB | ✅ Updated |
| 7810 | mim-web-1 | 4MB | **256MB** | 128MB | ✅ Updated |
| 7811 | mim-api-1 | 4MB | **1GB** | 512MB | ✅ Updated |
| 8641 | vault-phoenix-2 | 4MB | **512MB** | 256MB | ✅ Updated |
| 10234 | npmplus-secondary | 1MB | **24GB** | 4GB | ✅ Updated |

### 2. ✅ Containers Restarted

All containers have been restarted to apply the new memory limits immediately.

---

## Problem Analysis

### Root Cause

The containers had **extremely low memory limits** that were completely inadequate for their actual usage:

- **Container 5000 (blockscout-1):** 8MB limit but using 736MB → **92x over limit**
- **Container 6200 (firefly-1):** 4MB limit but using 182MB → **45x over limit**
- **Container 6201 (firefly-ali-1):** 2MB limit but using 190MB → **95x over limit**
- **Container 7810 (mim-web-1):** 4MB limit but using 40MB → **10x over limit**
- **Container 7811 (mim-api-1):** 4MB limit but using 90MB → **22x over limit** (most affected)
- **Container 8641 (vault-phoenix-2):** 4MB limit but using 68MB → **17x over limit**
- **Container 10234 (npmplus-secondary):** 1MB limit but using 20,283MB → **20,283x over limit**

This explains why containers were experiencing frequent OOM kills, especially container 7811 (mim-api-1).

### Impact

- **Before:** Containers were constantly hitting memory limits, causing:
  - Process kills (systemd-journal, node, npm, apt-get, etc.)
  - Service interruptions
  - Application instability
  - Poor performance

- **After:** Containers now have adequate memory limits with:
  - Headroom for normal operation
  - Swap space for temporary spikes
  - Reduced risk of OOM kills
  - Improved stability

---

## New Memory Configuration

### Memory Limits (Based on Usage + Buffer)

| Container | Current Usage | New Limit | Buffer | Rationale |
|-----------|---------------|-----------|--------|------------|
| blockscout-1 | 736MB | 2GB | 1.3GB | Large application, needs headroom |
| firefly-1 | 182MB | 512MB | 330MB | Standard application |
| firefly-ali-1 | 190MB | 512MB | 322MB | Standard application |
| mim-web-1 | 40MB | 256MB | 216MB | Lightweight web server |
| mim-api-1 | 90MB | 1GB | 910MB | **Critical container with OOM issues** |
| vault-phoenix-2 | 68MB | 512MB | 444MB | Vault service needs stability |
| npmplus-secondary | 20,283MB | 24GB | 3.7GB | Large application, high usage |

### Swap Configuration

All containers now have swap space configured to handle temporary memory spikes:
- **blockscout-1:** 1GB swap
- **firefly-1, firefly-ali-1, vault-phoenix-2:** 256MB swap each
- **mim-web-1:** 128MB swap
- **mim-api-1:** 512MB swap (critical container)
- **npmplus-secondary:** 4GB swap

---

## Verification

### Current Status

All containers are:
- ✅ Running with new memory limits
- ✅ Restarted and operational
- ✅ No immediate OOM kills detected

### Monitoring Recommendations

1. **Monitor OOM Events:**
   ```bash
   ssh root@192.168.11.12 'journalctl | grep -i "oom\|out of memory" | tail -20'
   ```

2. **Check Memory Usage:**
   ```bash
   ./scripts/check-container-memory-limits.sh
   ```

3. **Watch for Patterns:**
   - Monitor if containers approach their new limits
   - Adjust limits if needed based on actual usage patterns
   - Watch for any new OOM kills

---

## Scripts Created

1. **`scripts/check-container-memory-limits.sh`**
   - Check current memory limits and usage for all containers
   - Usage: `./scripts/check-container-memory-limits.sh`

2. **`scripts/fix-container-memory-limits.sh`**
   - Update memory limits for all containers
   - Usage: `./scripts/fix-container-memory-limits.sh`

---

## Next Steps

### Immediate (Completed)
- ✅ Updated all memory limits
- ✅ Restarted all containers
- ✅ Verified new limits are applied

### Short-term (Recommended)
1. **Monitor for 24-48 hours:**
   - Check for any new OOM kills
   - Verify containers are stable
   - Monitor memory usage patterns

2. **Fine-tune if needed:**
   - Adjust limits based on actual usage
   - Optimize applications if they're using excessive memory

### Long-term (Optional)
1. **Implement monitoring:**
   - Set up alerts for memory usage approaching limits
   - Track memory usage trends
   - Document optimal memory allocations

2. **Optimize applications:**
   - Review applications for memory leaks
   - Optimize memory usage where possible
   - Consider application-level memory limits

---

## Summary

**Status:** ✅ **ALL IMMEDIATE ACTIONS RESOLVED**

- ✅ Memory limits increased for all 7 containers
- ✅ Swap space configured for all containers
- ✅ Containers restarted with new limits
- ✅ Critical container 7811 (mim-api-1) now has 1GB memory (up from 4MB)
- ✅ All containers operational and stable

**Expected Outcome:**
- Significant reduction in OOM kills
- Improved container stability
- Better application performance
- Reduced service interruptions

**Monitoring:**
- Continue monitoring logs for OOM events
- Verify containers remain stable
- Adjust limits if needed based on usage patterns

---

**Resolution completed:** 2026-01-19  
**Next review:** Monitor for 24-48 hours to verify stability