SLUB:Unable to Allocate Memory

故障

如图：系统日志中报出不能分配内存

解决方法：

• 临时解决：重启相关节点
• 永久解决：

  • 升级内核：3.10.0-1062.XXX.el7.x86_64

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      yum provides kernel  
      yum install -y kernel-3.10.0-1062.9.1.el7.x86_64  
      awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg  
        

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* 添加内核参数 cgroup.memory=nokmem

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      [root@acp2-node-1 ~]# cat /etc/default/grub  
      GRUB_TIMEOUT=5  
      GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"  
      GRUB_DEFAULT=saved  
      GRUB_DISABLE_SUBMENU=true  
      GRUB_TERMINAL="serial console"  
      GRUB_TERMINAL_OUTPUT="serial console"  
      GRUB_CMDLINE_LINUX="crashkernel=auto cgroup.memory=nokmem console=ttyS0 console=tty0 panic=5 net.ifnames=0 biosdevname=0"  
      GRUB_DISABLE_RECOVERY="true"  
      GRUB_SERIAL_COMMAND="serial --speed=9600 --unit=0 --word=8 --parity=no --stop=1"  
      [root@acp2-node-1 ~]#  
        

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* 保存退出，刷新grup菜单，并重启节点使永久生效

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      [root@acp2-node-1 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg  
      [root@acp2-node-1 ~]# reboot  
        

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* 查看是否生效

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      [root@region ~]# cat /proc/cmdline  
      BOOT_IMAGE=/vmlinuz-3.10.0-1062.9.1.el7.x86_64 root=/dev/mapper/centos-root ro crashkernel=auto cgroup.memory=nokmem rd.lvm.lv=centos/root rhgb quiet  
        

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