---
id: f3bc6c7b-bf49-4778-b5af-575a409a7c90
---

# High Nginx Request Time to First Byte (TTFB) Incident.
---

This incident type refers to a situation where the time taken by Nginx server to send the first byte of the response to the client is high. This results in a slow loading website or application. It could be caused by various factors such as network latency, server overload, improper configuration, or other issues with the server. This incident type requires immediate attention to reduce the TTFB and improve the overall website or application performance.

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

export URL="PLACEHOLDER"

export PATH_TO_CONFIG_FILE="PLACEHOLDER"
```

## Debug

### Check the Nginx status
```shell
systemctl status nginx
```

### Check the Nginx error log for any errors
```shell
tail -f /var/log/nginx/error.log
```

### Check the Nginx access log for the request processing time
```shell
tail -f /var/log/nginx/access.log | awk '{print $1,$4,$7,$8}'
```

### Check the network latency between the client and server
```shell
traceroute ${SERVER_IP}
```

### Check the server CPU and memory usage
```shell
top
```

### Check the disk usage on the server
```shell
df -h
```

### Check the network usage on the server
```shell
iftop
```

### Check the server DNS resolution
```shell
nslookup ${SERVER_IP}
```

### Check server response time for a specific URL
```shell
curl -w "Total time: %{time_total}\n" -o /dev/null -s ${URL}
```

## Repair

### Review and make changes to the Nginx configuration file to ensure it is optimized for performance.
```shell
#!/bin/bash



# Specify the Nginx configuration file path

nginx_conf=${PATH_TO_CONFIG_FILE}



# Increase worker processes and connections

sed -i 's/worker_processes.*/worker_processes auto;/' "$nginx_conf"

sed -i 's/worker_connections.*/worker_connections 1024;/' "$nginx_conf"



# Enable gzip compression

sed -i '/gzip on;/a \    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;' "$nginx_conf"



# Configure client-side caching

cat <<EOL >> "$nginx_conf"

location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {

    expires 7d;

    add_header Cache-Control "public, max-age=604800, immutable";

}

EOL



# Enable proxy buffering

sed -i '/http {/a \    proxy_buffering on;' "$nginx_conf"

sed -i '/proxy_buffering on;/a \    proxy_buffer_size 8k;' "$nginx_conf"

sed -i '/proxy_buffer_size 8k;/a \    proxy_buffers 8 8k;' "$nginx_conf"



# Add FastCGI caching (modify paths and cache settings)

cat <<EOL >> "$nginx_conf"

fastcgi_cache_path /path/to/cache levels=1:2 keys_zone=my_cache:10m;

server {

    location / {

        fastcgi_cache my_cache;

        fastcgi_cache_valid 200 1h;

        fastcgi_cache_key "\$scheme\$request_method\$host\$request_uri";

        ...

    }

}

EOL



# Add proxy caching (modify paths and cache settings)

cat <<EOL >> "$nginx_conf"

proxy_cache_path /path/to/cache levels=1:2 keys_zone=my_cache:10m;

server {

    location / {

        proxy_cache my_cache;

        proxy_cache_valid 200 1h;

        proxy_cache_key "\$scheme\$request_method\$host\$request_uri";

        ...

    }

}

EOL



# Configure keep-alive connections

sed -i 's/keepalive_timeout.*/keepalive_timeout 65;/' "$nginx_conf"

sed -i '/keepalive_timeout 65;/a \    keepalive_requests 100;' "$nginx_conf"



# Reload Nginx to apply changes

service nginx reload


```

This incident type refers to a situation where the time taken by Nginx server to send the first byte of the response to the client is high. This results in a slow loading website or application. It could be caused by various factors such as network latency, server overload, improper configuration, or other issues with the server. This incident type requires immediate attention to reduce the TTFB and improve the overall website or application performance.


```shell
export SERVER_IP="PLACEHOLDER"

export URL="PLACEHOLDER"

export PATH_TO_CONFIG_FILE="PLACEHOLDER"
```


### Check the Nginx status

```shell
systemctl status nginx
```

### Check the Nginx error log for any errors

```shell
tail -f /var/log/nginx/error.log
```

### Check the Nginx access log for the request processing time

```shell
tail -f /var/log/nginx/access.log | awk '{print $1,$4,$7,$8}'
```

### Check the network latency between the client and server

```shell
traceroute ${SERVER_IP}
```

### Check the server CPU and memory usage

```shell
top
```

### Check the disk usage on the server

```shell
df -h
```

### Check the network usage on the server

```shell
iftop
```

### Check the server DNS resolution

```shell
nslookup ${SERVER_IP}
```

### Check server response time for a specific URL

```shell
curl -w "Total time: %{time_total}\n" -o /dev/null -s ${URL}
```


### Review and make changes to the Nginx configuration file to ensure it is optimized for performance.

```shell
#!/bin/bash



# Specify the Nginx configuration file path

nginx_conf=${PATH_TO_CONFIG_FILE}



# Increase worker processes and connections

sed -i 's/worker_processes.*/worker_processes auto;/' "$nginx_conf"

sed -i 's/worker_connections.*/worker_connections 1024;/' "$nginx_conf"



# Enable gzip compression

sed -i '/gzip on;/a \    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;' "$nginx_conf"



# Configure client-side caching

cat <<EOL >> "$nginx_conf"

location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {

    expires 7d;

    add_header Cache-Control "public, max-age=604800, immutable";

}

EOL



# Enable proxy buffering

sed -i '/http {/a \    proxy_buffering on;' "$nginx_conf"

sed -i '/proxy_buffering on;/a \    proxy_buffer_size 8k;' "$nginx_conf"

sed -i '/proxy_buffer_size 8k;/a \    proxy_buffers 8 8k;' "$nginx_conf"



# Add FastCGI caching (modify paths and cache settings)

cat <<EOL >> "$nginx_conf"

fastcgi_cache_path /path/to/cache levels=1:2 keys_zone=my_cache:10m;

server {

    location / {

        fastcgi_cache my_cache;

        fastcgi_cache_valid 200 1h;

        fastcgi_cache_key "\$scheme\$request_method\$host\$request_uri";

        ...

    }

}

EOL



# Add proxy caching (modify paths and cache settings)

cat <<EOL >> "$nginx_conf"

proxy_cache_path /path/to/cache levels=1:2 keys_zone=my_cache:10m;

server {

    location / {

        proxy_cache my_cache;

        proxy_cache_valid 200 1h;

        proxy_cache_key "\$scheme\$request_method\$host\$request_uri";

        ...

    }

}

EOL



# Configure keep-alive connections

sed -i 's/keepalive_timeout.*/keepalive_timeout 65;/' "$nginx_conf"

sed -i '/keepalive_timeout 65;/a \    keepalive_requests 100;' "$nginx_conf"



# Reload Nginx to apply changes

service nginx reload


```


High Nginx Request Time to First Byte (TTFB) Incident.

Overview

Parameters

Debug

Check the Nginx status

Check the Nginx error log for any errors

Check the Nginx access log for the request processing time

Check the network latency between the client and server

Check the server CPU and memory usage

Check the disk usage on the server

Check the network usage on the server

Check the server DNS resolution

Check server response time for a specific URL

Repair

Review and make changes to the Nginx configuration file to ensure it is optimized for performance.

Learn more

Related Runbooks

Support