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最初我是用 kernel 官方版本的 sorce code 編譯 + CentOS make InitRamFs "dracut -f" 安裝, 但遇上了 Driver Signature 的問題一直不能解決. 想了想後決定用 SRPM 來完成. 比較之後 以 SRPM 編譯成 RPM, 然後以這個 RPM 來安裝是最簡單的方式. 它避開了 Driver Signature 的問題. 
 

Download The CentOs Kernel-3.10.0 Source RPM
 

# cd ~
# wget http://buildlogs.centos.org/c7.1511.00/kernel/20151119220809/3.10.0-327.el7.x86_64/kernel-3.10.0-327.el7.src.rpm
...

Install The CentOs Kernel-3.10.0 Source RPM or Use `rpm2cpio` to Extract it
 

# rpm -ivh kernel-3.10.0-327.el7.src.rpm
...

# rpm2cpio kernel-3.10.0-327.el7.centos.x86_64.rpm | cpio ivd
# ls
BUILD  BUILDROOT  RPMS  SOURCES  SPECS  SRPMS

Edit The Default Kernel Config File
 

# cd /usr/src/
# cd ./SOURCES/
# vi kernel-3.10.0-x86_64.config
...

Change The Ramdisk Count to 2 And Size to 4GB
 

....
CONFIG_BLK_DEV_RAM_COUNT=2
CONFIG_BLK_DEV_RAM_SIZE=4194304
....

Build The RPM from The Given Source RPM (takes long time)
 

#### kernel-3.10.0-x86_64.config
# cd /usr/src/
...
# cd ./SOURCES/
# rpmbuild -ba kernel.spec
....

Install The New Compiled RPM
 

# ls RPMS/x86_64/kernel-3.10.0-327.el7.centos.x86_64.rpm
...
# rpm -ivh RPMS/x86_64/kernel-3.10.0-327.el7.centos.x86_64.rpm
...

Or We Update The New Compiled Modules `rbd.ko`
 

# ls RPMS/x86_64/kernel-3.10.0-327.el7.centos.x86_64.rpm
...
# mkdir -p tmp ; cd tmp
# rpm2cpio kernel-3.10.0-327.el7.centos.x86_64.rpm | cpio -ivd
...

# cp /lib/modules/3.10.0-327.el7.x86_64/kernel/drivers/block/rbd.ko /lib/modules/3.10.0-327.el7.x86_64/kernel/drivers/block/rbd-backup.ko

# cp lib/modules/3.10.0-327.el7.x86_64/kernel/drivers/block/rbd.ko /lib/modules/3.10.0-327.el7.x86_64/kernel/drivers/block/
...

# vi /etc/rc.local
...
mknod -m 640 /dev/ram0 b 1 0
mknod -m 640 /dev/ram1 b 1 1
mkfs -t ext2 /dev/ram1
mkfs.xfs -f ext2 /dev/ram1
mkdir -p /mnt/ram1
mount /dev/ram1 /mnt/ram1
...
# reboot
...

# df -m
...
/dev/ram1   4086    33    4054    1%    /mnt/ram1
...

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Email: jasonc@mail2000.com.tw