1. ubuntu修改最大文件数，进程数
echo "* hard nofile 262144" >> /etc/security/limits.conf
echo "* soft nofile 262144" >> /etc/security/limits.conf
echo "root hard nofile 262144" >> /etc/security/limits.conf
echo "root soft nofile 262144" >> /etc/security/limits.conf
echo "* hard nproc 262144" >> /etc/security/limits.conf
echo "* soft nproc 262144" >> /etc/security/limits.conf
echo "root hard nproc 262144" >> /etc/security/limits.conf
echo "root soft nproc 262144" >> /etc/security/limits.conf
echo "session required pam_limits.so" >> /etc/pam.d/common-session
ulimit -HSn
262144
