四、修改内核配置文件--两个节点都要执行
这个在OCM环境已经配置好
To view the current value specified for these kernel parameters, and to change them if necessary, follow these steps:
-
Enter the commands shown in the following table to view the current values of the kernel parameters:
Note:
Make a note of the current values and identify any values that you must change.
-
If the value of any kernel parameter is different from the recommended value, then complete the following process:
Using any text editor, create or edit the /etc/sysctl.conf file,
and add or edit lines similar to the following:
Note:
Include lines only for the kernel parameter values that you want to change. For the semaphore parameters (
kernel.sem), you must specify all four values. However, if any of the current system parameter values are greater than the recommended values,
then keep using the larger values.
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
fs.file-max = 65536
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 262144
net.core.rmem_max = 1048576
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
By specifying the values in the /etc/sysctl.conf file, they persist when you restart the system.
On Red Hat systems, to have these changes take effect immediately so that you do not have to restart the system, enter the following command:
/sbin/sysctl -p
-
Repeat steps 1 and 2 on all other nodes in the cluster.
On SUSE systems only, enter the following command to cause the system to read the /etc/sysctl.conf file when it restarts:
# /sbin/chkconfig boot.sysctl on
-
On SUSE Linux Enterprise Server 9.0 only, set the kernel parameter disable_cap_mlock as follows:
disable_cap_mlock = 1
-
After updating the values of kernel parameters in the /etc/sysctl.conf file, either restart the computer, or run the command sysctl -p to make the changes in the /etc/sysctl.conf file
available in the active kernel memory.
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我的修改如下：
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rac1节点
[root@rac1 ~]# cp /etc/sysctl.conf /etc/sysctl.conf.bak
[root@rac1 ~]# vi /etc/sysctl.conf
# Kernel sysctl configuration file for Oracle Enterprise 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
# See /usr/share/doc/kernel-doc-*/Documentation/networking/ip-sysctl.txt
net.ipv4.conf.default.rp_filter = 2
# 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 = 4294967295
# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 268435456
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
fs.file-max = 65536
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 262144
net.core.rmem_max = 1048576
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
"/etc/sysctl.conf" 47L, 1361C written
[root@rac1 ~]# sysctl -p
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 4294967295
kernel.shmall = 268435456
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
fs.file-max = 65536
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 262144
net.core.rmem_max = 1048576
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
[root@rac1 ~]#
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rac2节点
[root@rac2 ~]# cp /etc/sysctl.conf /etc/sysctl.conf.bak
[root@rac2 ~]# vi /etc/sysctl.conf
# Kernel sysctl configuration file for Oracle Enterprise 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
# See /usr/share/doc/kernel-doc-*/Documentation/networking/ip-sysctl.txt
net.ipv4.conf.default.rp_filter = 2
# 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 = 4294967295
# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 268435456
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
fs.file-max = 65536
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 262144
net.core.rmem_max = 1048576
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
"/etc/sysctl.conf" 47L, 1361C written
[root@rac2 ~]# sysctl -p
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 4294967295
kernel.shmall = 268435456
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
fs.file-max = 65536
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 262144
net.core.rmem_max = 1048576
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
[root@rac2 ~]#
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