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我正在开发的应用程序日志中收到“太多打开文件”消息.有人建议我:
>查找当前正在使用的打开文件数,系统范围和每个用户
>查找系统和用户打开文件的限制.
我运行ulimit -n并返回1024.我还查看了/etc/limits.conf并且该文件中没有任何特殊内容. /etc/sysctl.conf也未修改.我将列出以下文件的内容.我也跑了lsof | wc -l,返回5000行(如果我正确使用它).
所以,我的主要问题是:
>如何找到每个用户允许的打开文件数?软限制是在/etc/limits.conf中找到/定义的nofile设置吗?什么是默认值,因为我没有触及/etc/limits.conf?
>如何在系统范围内找到允许的打开文件数?它是limits.conf中的硬限制吗?如果不修改limits.conf,默认值是多少?
> ulimit为打开文件返回的数字是多少?它说1024但是当我运行lsof并计算线数时,它超过5000,所以有些东西不是我的点击.是否应该运行其他cmds或查看文件以获得这些限制?在此先感谢您的帮助.
# /etc/security/limits.conf # #Each line describes a limit for a user in the form: # #<domain> <type> <item> <value> # #Where: #<domain> can be: # - an user name # - a group name,with @group Syntax # - the wildcard *,for default entry # - the wildcard %,can be also used with %group Syntax,# for maxlogin limit # #<type> can have the two values: # - "soft" for enforcing the soft limits # - "hard" for enforcing hard limits # #<item> can be one of the following: # - core - limits the core file size (KB) # - data - max data size (KB) # - fsize - maximum filesize (KB) # - memlock - max locked-in-memory address space (KB) # - nofile - max number of open files # - RSS - max resident set size (KB) # - stack - max stack size (KB) # - cpu - max cpu time (MIN) # - nproc - max number of processes # - as - address space limit (KB) # - maxlogins - max number of logins for this user # - maxsyslogins - max number of logins on the system # - priority - the priority to run user process with # - locks - max number of file locks the user can hold # - sigpending - max number of pending signals # - msgqueue - max memory used by POSIX message queues (bytes) # - nice - max nice priority allowed to raise to values: [-20,19] # - rtprio - max realtime priority # #<domain> <type> <item> <value> # #* soft core 0 #* hard RSS 10000 #@student hard nproc 20 #@faculty soft nproc 20 #@faculty hard nproc 50 #ftp hard nproc 0 #@student - maxlogins 4 # End of file
# Controls IP packet forWARDing net.ipv4.ip_forWARD = 0 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routIng net.ipv4.conf.default.accept_source_route = 0 # Controls the System request debugging functionality of the kernel kernel.sysrq = 0 # Controls whether core dumps will append the PID to the core filename # Useful for debugging multi-threaded applications kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 # Controls the maximum size of a message,in bytes kernel.msgmnb = 65536 # Controls the default maxmimum size of a mesage queue kernel.msgmax = 65536 # Controls the maximum shared segment size,in bytes kernel.shmmax = 68719476736 # Controls the maximum number of shared memory segments,in pages kernel.shmall = 4294967296 # thE interval between the last data packet sent and the first keepalive probe net.ipv4.tcp_keepalive_time = 600 # thE interval between subsequential keepalive probes net.ipv4.tcp_keepalive_intvl = 60 # thE interval between the last data packet sent and the first keepalive probe net.ipv4.tcp_keepalive_time = 600 # thE interval between subsequential keepalive probes net.ipv4.tcp_keepalive_intvl = 60 # the number of unackNowledged probes to send before considering the connection dead and notifying the application layer net.ipv4.tcp_keepalive_probes = 10 # the number of unackNowledged probes to send before considering the connection dead and notifying the application layer net.ipv4.tcp_keepalive_probes = 10 # try as hard as possible not to swap,as safely as possible vm.swappi@R_489_11335@s = 1 fs.aio-max-nr = 1048576 #fs.file-max = 4096
此外,lsof的最初目的是LiSt Open Files,但它现在已经增长并列出了其他东西,比如Cwd和mmap region,这是它输出比你预期的更多行的另一个原因.
错误消息“Too many open files”与errno值EMFILE相关联,每个进程限制,在您的情况下似乎是1024.如果您可以找到正确的选项来限制lsof只@L_616_44@单个实际文件描述符过程中,你@R_259_9381@它们有1024个,或者非常接近的东西.
这些天很少需要手动调整系统范围的文件描述符限制,因为它的默认值与内存成比例.如果需要,可以在/ proc / sys / fs / file-max中找到它,并在/ proc / sys / fs / file-nr中找到有关当前用法的信息.您的sysctl文件的file-max值为4096,但它已被注释掉,因此您不应该认真对待它.
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