524 超时错误与多个连接

Question

我正在使用 JMeter 测试服务器性能，以模拟大量用户在短时间内访问我们的数字海洋服务器。当我将 JMeter 设置为 200 个用户并针对我基于 Laravel 的网页进行测试时，一切正常。当我将用户数增加到 500 时，我开始收到 524 错误。

服务器CPU从不超过10%，内存在30%，所以服务器有足够的电量。前几百个请求处理正确，但随后开始出现 524 错误。如该屏幕截图所示，失败的请求比成功的请求具有更高的延迟和连接。我应该从哪里开始寻找问题的任何线索？

可用站点中的我的 conf 文件

位置 ~.php$ {

try_files $uri =404;

fastcgi_pass unix:/var/run/php-fpm/xxxxxxxxxxxx.com.sock;
fastcgi_index index.php;

}

我的 nginx.conf 设置

fastcgi_buffers 8 128k;
  fastcgi_buffer_size 256k;

  client_header_timeout 3000;
  client_body_timeout 3000;
  fastcgi_read_timeout 3000;
  client_max_body_size 32m;

我的 /etc/sysctl.conf 文件设置，取自此 post 之前收到 504 错误 https://www.digitalocean.com/community/questions/getting-nginx-fpm-sock-error

# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).

### IMPROVE SYSTEM MEMORY MANAGEMENT ###

# Increase size of file handles and inode cache
fs.file-max = 2097152

# Do less swapping
vm.swappiness = 10
vm.dirty_ratio = 60
vm.dirty_background_ratio = 2

### GENERAL NETWORK SECURITY OPTIONS ###

# Number of times SYNACKs for passive TCP connection.
net.ipv4.tcp_synack_retries = 2

# Allowed local port range
net.ipv4.ip_local_port_range = 2000 65535

# Protect Against TCP Time-Wait
net.ipv4.tcp_rfc1337 = 1

# Decrease the time default value for tcp_fin_timeout connection
net.ipv4.tcp_fin_timeout = 15

# Decrease the time default value for connections to keep alive
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 15

### TUNING NETWORK PERFORMANCE ###

# Default Socket Receive Buffer
net.core.rmem_default = 31457280

# Maximum Socket Receive Buffer
net.core.rmem_max = 12582912

# Default Socket Send Buffer
net.core.wmem_default = 31457280

# Maximum Socket Send Buffer
net.core.wmem_max = 12582912

# Increase number of incoming connections
net.core.somaxconn = 65535

# Increase number of incoming connections backlog
net.core.netdev_max_backlog = 65535

# Increase the maximum amount of option memory buffers
net.core.optmem_max = 25165824

# Increase the maximum total buffer-space allocatable
# This is measured in units of pages (4096 bytes)
net.ipv4.tcp_mem = 65535 131072 262144
net.ipv4.udp_mem = 65535 131072 262144

# Increase the read-buffer space allocatable
net.ipv4.tcp_rmem = 8192 87380 16777216
net.ipv4.udp_rmem_min = 16384

# Increase the write-buffer-space allocatable
net.ipv4.tcp_wmem = 8192 65535 16777216
net.ipv4.udp_wmem_min = 16384

# Increase the tcp-time-wait buckets pool size to prevent simple DOS attacks
net.ipv4.tcp_max_tw_buckets = 1440000
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1

将此添加到 /etc/security/limits.conf

nginx           soft    nofile          2097152
nginx           hard    nofile          2097152
www-data        soft    nofile          2097152
www-data        hard    nofile          2097152

我的 php-fpm.d 配置文件设置

pm = static
pm.max_children = 40
pm.start_servers = 8
pm.min_spare_servers = 4
pm.max_spare_servers = 8
; number of processes to process before respawning. Lower number if you have memory leaks, but each respawn takes time
pm.max_requests=50
; pm.process_idle_timeout=10

chdir = /

php_admin_value[disable_functions] = exec,passthru,shell_exec,system
php_admin_flag[allow_url_fopen] = on
php_admin_flag[log_errors] = on

php_admin_value[post_max_size] = 8M
php_admin_value[upload_max_filesize] = 8M

Answer 1

HTTP 524 错误 are cloudflare specific - 它们不是由您自己的 nginx 安装生成的。 Cloudflare 放弃等待您的后端服务的响应，可能是因为可用于处理请求的 fpm 子级数量很少。

524 A Timeout Occurred

Cloudflare was able to complete a TCP connection to the origin server, but did not receive a timely HTTP response.

如果您要对自己的服务器设置进行性能测试，请不要通过指向 cloudflare 的端点。

http 服务器的一般“后端超时”响应是 504 网关超时。

524 超时错误与多个连接

524 time out error with mutiiple connections

nginx

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