Unable to allocate shared memory

yoali luque

• August 08, 2017 16:42

stackoverflow.com/questions/31620082/apache-memory-error
Fatal Error Unable to allocate shared memory segment
Use ipcs -lm to determine current shared memory limits. And use ipcs -ma to determine how much shared memory is currently in use. UPDATE you have added the comment to show "max seg size (kbytes) = 32768". So max segment size is 32MB. Original error is "Unable to allocate shared memory segment of 67108864 bytes". So unable to allocate segment of 64MB. Increase your maximum shared memory segment size from 32MB to 128MB. echo "134217728" >/proc/sys/kernel/shmmax echo "134217728" >/proc/sys/kernel/shmall And then retry. If apache2 then works ok, make the change survive reboots, by placing an entry in /etc/sysctl.conf as below: kernel.shmmax=134217728 kernel.shmall=134217728
in my server
# ipcs -lm ------ Shared Memory Limits -------- max number of segments = 4096 max seg size (kbytes) = 32768 max total shared memory (kbytes) = 8388608 min seg size (bytes) = 1 # ipcs -ma ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status ------ Semaphore Arrays -------- key semid owner perms nsems 0x00000000 0 root 600 1 0x00000000 5275649 nobody 600 1 0x00000000 5046274 nobody 600 1 0x00000000 5079043 nobody 600 1 0x00000000 5308420 nobody 600 1 0x00000000 5341189 nobody 600 1 0x00000000 5373958 nobody 600 1 ------ Message Queues -------- key msqid owner perms used-bytes messages
What appears as modify in syst file is commented, I do not see any meaning to it, then where the values are really modified so I can put the shared memory I need File: /etc/sysctl.conf
# Kernel sysctl configuration file for Red Hat Linux # # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and # sysctl.conf(5) for more details. # 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 default maxmimum size of a mesage queue # kernel.msgmnb = 65536 # Controls the maximum size of a message, in bytes # 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


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  cPanelMichael

  • August 09, 2017 15:18

  Hello, Can you verify if you are using CloudLinux on this system? Thank you.

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  yoali luque

  • August 09, 2017 18:13

  # cat /etc/issue CentOS release 6.9 (Final)

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  cPanelMichael

  • August 10, 2017 16:12

  Hello, Could you open a support ticket using the link in my signature so we can take a closer look at the system? Thank you.

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