---
id: 103b2fba-0e1e-4220-b105-f0f7da88d93f
---

# Redis Memory Fragmentation Incident
---

Redis is an in-memory data structure store that is widely used as a caching layer in various software applications. However, frequent Redis memory fragmentation incidents occur when the memory used by Redis is not contiguous and becomes fragmented over time. This can lead to increased memory usage and slower performance of the application. When this type of incident occurs, it may require analysis and optimization of the Redis configuration to improve its memory management and reduce fragmentation.

### Parameters
```shell
export MAX_MEMORY="PLACEHOLDER"

export EVICTION_POLICY="PLACEHOLDER"
```

## Debug

### Check Redis memory usage
```shell
redis-cli info memory
```

### Check Redis fragmentation ratio
```shell
redis-cli info memory | grep fragmentation_ratio
```

### Check the amount of memory Redis is using for different types of data
```shell
redis-cli memory stats
```

### Check the number of keys in Redis and their memory usage
```shell
redis-cli --bigkeys
```

### Check if Redis is swapping memory to disk
```shell
vmstat 1
```

### Check the amount of free memory available on the system
```shell
free -h
```

### Check if any other processes are consuming too much memory
```shell
ps aux --sort=-%mem | head
```

## Repair

### Optimize the Redis configuration by tuning the maxmemory parameter and setting eviction policies to prevent over-allocation of memory.
```shell


#!/bin/bash



# Set the maxmemory parameter to ${MAX_MEMORY} in the Redis configuration file

sudo sed -i "s/^maxmemory .*/maxmemory ${MAX_MEMORY}/" /etc/redis/redis.conf



# Set the eviction policy to ${EVICTION_POLICY} in the Redis configuration file

sudo sed -i "s/^maxmemory-policy .*/maxmemory-policy ${EVICTION_POLICY}/" /etc/redis/redis.conf



# Restart the Redis service to apply the new configuration

sudo systemctl restart redis.service





sudo ./redis_optimize.sh


```

Redis is an in-memory data structure store that is widely used as a caching layer in various software applications. However, frequent Redis memory fragmentation incidents occur when the memory used by Redis is not contiguous and becomes fragmented over time. This can lead to increased memory usage and slower performance of the application. When this type of incident occurs, it may require analysis and optimization of the Redis configuration to improve its memory management and reduce fragmentation.


```shell
export MAX_MEMORY="PLACEHOLDER"

export EVICTION_POLICY="PLACEHOLDER"
```


### Check Redis memory usage

```shell
redis-cli info memory
```

### Check Redis fragmentation ratio

```shell
redis-cli info memory | grep fragmentation_ratio
```

### Check the amount of memory Redis is using for different types of data

```shell
redis-cli memory stats
```

### Check the number of keys in Redis and their memory usage

```shell
redis-cli --bigkeys
```

### Check if Redis is swapping memory to disk

```shell
vmstat 1
```

### Check the amount of free memory available on the system

```shell
free -h
```

### Check if any other processes are consuming too much memory

```shell
ps aux --sort=-%mem | head
```


### Optimize the Redis configuration by tuning the maxmemory parameter and setting eviction policies to prevent over-allocation of memory.

```shell


#!/bin/bash



# Set the maxmemory parameter to ${MAX_MEMORY} in the Redis configuration file

sudo sed -i "s/^maxmemory .*/maxmemory ${MAX_MEMORY}/" /etc/redis/redis.conf



# Set the eviction policy to ${EVICTION_POLICY} in the Redis configuration file

sudo sed -i "s/^maxmemory-policy .*/maxmemory-policy ${EVICTION_POLICY}/" /etc/redis/redis.conf



# Restart the Redis service to apply the new configuration

sudo systemctl restart redis.service





sudo ./redis_optimize.sh


```


Redis Memory Fragmentation Incident

Overview

Parameters

Debug

Check Redis memory usage

Check Redis fragmentation ratio

Check the amount of memory Redis is using for different types of data

Check the number of keys in Redis and their memory usage

Check if Redis is swapping memory to disk

Check the amount of free memory available on the system

Check if any other processes are consuming too much memory

Repair

Optimize the Redis configuration by tuning the maxmemory parameter and setting eviction policies to prevent over-allocation of memory.

Learn more

Related Runbooks

Support