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PHP-fpm Too Many Open Files 24 Error (set open file descriptor limit)

I am getting the following error in my /var/log/php7.0-fpm.log file:
        “ERROR: failed to prepare the stderr pipe: Too many open files (24)
How do I fix this problem?
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Linux how long a process has been running?

I‘m a new Linux system user. How do I check how long a process or pid has been running on my Ubuntu Linux server?
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How do I speed up my apt-get or apt command to download packages from multiple repos on a Ubuntu Linux 16.04 or 14.04 LTS server?
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How to fix Httpoxy a CGI PHP/Nginx/Apache/Go application vulnerability on Linux or Unix

A serious vulnerability was discovered in how CGI scripts are used by Linux or Unix that use PHP, Go, Python, and other scripting languages. How do I fix Httpoxy a CGI application vulnerability on Linux or Unix for HAProxy, Varnish, Nginx, PHP, Go, Python, Tomcat and others?
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How to get Ethernet Link Speed in MAC OS X Through Command Prompt

I‘m a Mac OS X user. How do I find out my Ethernet Link Speed in terminal using bash shell prompt? How do I see my current Ethernet connection Speed in Mac OS X?
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Ubuntu setup a bonding device and enslave two real Ethernet devices

How do I setup a bonding device bond0 and enslave two real Ethernet (say eth0 and eth2) devices to it on Ubuntu Linux 140.04 or 16.04 LTS server? How can I create 802.3ad bonding mode (IEEE 802.3ad Dynamic link aggregation) on Ubuntu Linux 16.04 LTS server?
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How to determine Linux guest VM virtualization technology

I have a cloud-based virtual machine running Ubuntu and CentOS Linux server. It may or may not be virtualized. How do I determine what kind of virtualization technology (VMWARE/ KVM/ XEN/ VirtualBox/ Container/ lxc/Hyper-V etc.) a Linux guest system running on? How do I find out the virtualization type of a CentOS 7 Linux VPS?
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