Installing Docker for Mac is super easy. It is a simple as downloading and copying the program to the application folder.

To download Docker for Mac visit the docker site:
https://docs.docker.com/docker-for-mac/

Please download the stable release.

NewImage
Simply Drag and Drop the Docker icon to the Application folder. It is that easy to install Docker on the Mac.

Launch Docker from the applications folder. Since this is the first time you are invoking Docker, you will get the standard message about Docker being an “… application downloaded from the Internet. Are you sure that you want to open it?” Click on the Open button.

NewImage

At the Welcome screen, click on the Next button

NewImage
Click on the OK button to allow for privileged access.

You will be asked to provide your password. Enter your password to finish the installation process. Now, you will see docker on your task bar on top of the screen.

NewImage

Optionally un-select the Send diagnostics & usage data check box; click on “Got it” button to complete the installation.

Now from any terminal, type the following commands:

Dobbys-MacBook-Pro:~ Dobby$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
Dobbys-MacBook-Pro:~ Dobby$ docker info
Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
Images: 0
Server Version: 1.12.3
Storage Driver: aufs
 Root Dir: /var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 0
 Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: null host bridge overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Security Options: seccomp
Kernel Version: 4.4.27-moby
Operating System: Alpine Linux v3.4
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 1.951 GiB
Name: moby
ID: YGJ4:TIP6:KYX5:EK5X:REV3:3KEL:O3AP:6UIF:2DGX:YYDR:OGCX:QOSY
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): true
 File Descriptors: 15
 Goroutines: 27
 System Time: 2016-11-19T15:45:11.894167372Z
 EventsListeners: 1
No Proxy: *.local, 169.254/16
Registry: https://index.docker.io/v1/
WARNING: No kernel memory limit support
Insecure Registries:
 127.0.0.0/8

Next, click on the Docker logo on the top status bar and select Preferences. Move the memory indicator to 4GB or more and click the restart button at the button of the screen.


Here’s a simple script that anyone can use to check for lags in Data Guard. Basically, there’s two kind of lags in Data Guard that we want to monitor. The first is the apply_lag which is the amount of time the standby database is lagging behind relative to the primary database due to application of redo data. The second is the transport_lag which provides information about how much redo data is behind (in terms of time) because it is not available or applicable on the standby database. The transport lag can be used to determine bandwidth issues between the primary and stanby database sites.

You can specify the MIN_THRESHOLD parameter which will be the 2nd parameter that is passed into the dg_check_lag.ksh script (below). For lot of our customers who are on Active Data Guard, we change this script to determine seconds that the transport and apply lag is behind by. It is common for us to send alerts when the transport or apply lag is greater than 30 seconds for Active Data Guard customers.

Stay tuned as I will reveal scripts to monitor gaps in archive log sequences. I use the term gap loosely here as it is not determining the gap from v$archive_gap but looking at the number of applied archive logs on the standby database and comparing the applied archive logs to the maximum sequence number based on the thread number.

Come visit Viscosity North America for latest updates to local events, white papers and case studies.


In the first part of this series, we went through installing Oracle Linux 7 Update 2. In this part of the series, we will configure the Oracle Linux UEK OS, configure the docker image, and configure OSCSA (Oracle Storage Cloud Software Appliance).

First add the UEKR4 channel to the /etc/yum.repos.d/ repository:

[ol7_UEKR4]
name=Latest Unbreakable Enterprise Kernel Release 4 for Oracle Linux $releasever ($basearch)
baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL7/UEKR4/$basearch/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
gpgcheck=1
enabled=1

We need to boot the Linux Host Using the UEK4 Kernel. The UEK version that ships from Oracle Linux 7 update 2 is UEK 3 Release 8.

We need to remove the UEK 3.8 first. You will encounter errors about the packages that the 3.8 kernel is dependent on. If you see such errors similar to what you see below, you can ignore them.

[root@oscsa yum.repos.d]# rpm -qa |grep -i kernel
kernel-uek-firmware-3.8.13-98.7.1.el7uek.noarch
kernel-uek-3.8.13-98.7.1.el7uek.x86_64
kernel-tools-3.10.0-327.el7.x86_64
kernel-3.10.0-327.el7.x86_64
kernel-tools-libs-3.10.0-327.el7.x86_64
abrt-addon-kerneloops-2.1.11-34.0.1.el7.x86_64
[root@oscsa yum.repos.d]# rpm -e kernel-uek
warning: file /lib/modules/3.8.13-98.7.1.el7uek.x86_64/modules.symbols.bin: remove failed: No such file or directory
warning: file /lib/modules/3.8.13-98.7.1.el7uek.x86_64/modules.softdep: remove failed: No such file or directory
warning: file /lib/modules/3.8.13-98.7.1.el7uek.x86_64/modules.devname: remove failed: No such file or directory
warning: file /lib/modules/3.8.13-98.7.1.el7uek.x86_64/modules.dep.bin: remove failed: No such file or directory
warning: file /lib/modules/3.8.13-98.7.1.el7uek.x86_64/modules.builtin.bin: remove failed: No such file or directory
warning: file /lib/modules/3.8.13-98.7.1.el7uek.x86_64/modules.alias.bin: remove failed: No such file or directory
[root@oscsa yum.repos.d]# rpm -qa |grep -i kernel
kernel-uek-firmware-3.8.13-98.7.1.el7uek.noarch
kernel-tools-3.10.0-327.el7.x86_64
kernel-3.10.0-327.el7.x86_64
kernel-tools-libs-3.10.0-327.el7.x86_64
abrt-addon-kerneloops-2.1.11-34.0.1.el7.x86_64

[root@oscsa yum.repos.d]# rpm -e kernel-uek-firmware-3.8.13-98.7.1.el7uek.noarch

Now we can install UEK 4:

[root@oscsa yum.repos.d]# yum install kernel-uek
Loaded plugins: langpacks, ulninfo
ol7_UEKR3                                                                                                                         | 1.2 kB  00:00:00     
ol7_UEKR4                                                                                                                         | 1.2 kB  00:00:00     
ol7_latest                                                                                                                        | 1.4 kB  00:00:00     
(1/2): ol7_UEKR4/x86_64/updateinfo                                                                                                |  32 kB  00:00:00     
(2/2): ol7_UEKR4/x86_64/primary                                                                                                   | 8.9 MB  00:00:03     
ol7_UEKR4                                                                                                                                        208/208
Resolving Dependencies
--> Running transaction check
---> Package kernel-uek.x86_64 0:4.1.12-61.1.16.el7uek will be installed
--> Processing Dependency: kernel-firmware = 4.1.12-61.1.16.el7uek for package: kernel-uek-4.1.12-61.1.16.el7uek.x86_64
--> Processing Dependency: dracut-kernel >= 033-360.0.3 for package: kernel-uek-4.1.12-61.1.16.el7uek.x86_64
--> Processing Dependency: linux-firmware >= 20160604-44.git57b649d9.0.2 for package: kernel-uek-4.1.12-61.1.16.el7uek.x86_64
--> Running transaction check
---> Package dracut.x86_64 0:033-359.0.1.el7 will be updated
--> Processing Dependency: dracut = 033-359.0.1.el7 for package: dracut-network-033-359.0.1.el7.x86_64
--> Processing Dependency: dracut = 033-359.0.1.el7 for package: dracut-config-rescue-033-359.0.1.el7.x86_64
---> Package dracut.x86_64 0:033-360.0.3.el7_2.1 will be an update
---> Package kernel-uek-firmware.noarch 0:4.1.12-61.1.16.el7uek will be installed
---> Package linux-firmware.noarch 0:20150904-43.git6ebf5d5.0.1.el7 will be updated
---> Package linux-firmware.noarch 0:20160604-44.git57b649d9.0.2.el7 will be an update
--> Running transaction check
---> Package dracut-config-rescue.x86_64 0:033-359.0.1.el7 will be updated
---> Package dracut-config-rescue.x86_64 0:033-360.0.3.el7_2.1 will be an update
---> Package dracut-network.x86_64 0:033-359.0.1.el7 will be updated
---> Package dracut-network.x86_64 0:033-360.0.3.el7_2.1 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

=========================================================================================================================================================
 Package                                Arch                     Version                                              Repository                    Size
=========================================================================================================================================================
Installing:
 kernel-uek                             x86_64                   4.1.12-61.1.16.el7uek                                ol7_UEKR4                     42 M
Installing for dependencies:
 kernel-uek-firmware                    noarch                   4.1.12-61.1.16.el7uek                                ol7_UEKR4                    2.0 M
Updating for dependencies:
 dracut                                 x86_64                   033-360.0.3.el7_2.1                                  ol7_latest                   311 k
 dracut-config-rescue                   x86_64                   033-360.0.3.el7_2.1                                  ol7_latest                    49 k
 dracut-network                         x86_64                   033-360.0.3.el7_2.1                                  ol7_latest                    90 k
 linux-firmware                         noarch                   20160604-44.git57b649d9.0.2.el7                      ol7_latest                    31 M

Transaction Summary
=========================================================================================================================================================
Install  1 Package  (+1 Dependent package)
Upgrade             ( 4 Dependent packages)

Total download size: 75 M
Is this ok [y/d/N]: y
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
warning: /var/cache/yum/x86_64/7Server/ol7_latest/packages/dracut-033-360.0.3.el7_2.1.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY 
Public key for dracut-033-360.0.3.el7_2.1.x86_64.rpm is not installed
(1/6): dracut-033-360.0.3.el7_2.1.x86_64.rpm                                                                                      | 311 kB  00:00:00     
(2/6): dracut-config-rescue-033-360.0.3.el7_2.1.x86_64.rpm                                                                        |  49 kB  00:00:00     
(3/6): dracut-network-033-360.0.3.el7_2.1.x86_64.rpm                                                                              |  90 kB  00:00:00     
Public key for kernel-uek-firmware-4.1.12-61.1.16.el7uek.noarch.rpm is not installed                                   ] 1.8 MB/s | 8.7 MB  00:00:37 ETA 
(4/6): kernel-uek-firmware-4.1.12-61.1.16.el7uek.noarch.rpm                                                                       | 2.0 MB  00:00:03     
(5/6): kernel-uek-4.1.12-61.1.16.el7uek.x86_64.rpm                                                                                |  42 MB  00:00:24     
(6/6): linux-firmware-20160604-44.git57b649d9.0.2.el7.noarch.rpm                                                                  |  31 MB  00:00:26     
---------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                    2.8 MB/s |  75 MB  00:00:27     
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
Importing GPG key 0xEC551F03:
 Userid     : "Oracle OSS group (Open Source Software group) <build@oss.oracle.com>"
 Fingerprint: 4214 4123 fecf c55b 9086 313d 72f9 7b74 ec55 1f03
 Package    : 7:oraclelinux-release-7.2-1.0.5.el7.x86_64 (@anaconda/7.2)
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
  Updating   : dracut-033-360.0.3.el7_2.1.x86_64                                                                                                    1/10 
  Updating   : linux-firmware-20160604-44.git57b649d9.0.2.el7.noarch                                                                                2/10 
  Installing : kernel-uek-firmware-4.1.12-61.1.16.el7uek.noarch                                                                                     3/10 
  Installing : kernel-uek-4.1.12-61.1.16.el7uek.x86_64                                                                                              4/10 
  Updating   : dracut-network-033-360.0.3.el7_2.1.x86_64                                                                                            5/10 
  Updating   : dracut-config-rescue-033-360.0.3.el7_2.1.x86_64                                                                                      6/10 
  Cleanup    : dracut-config-rescue-033-359.0.1.el7.x86_64                                                                                          7/10 
  Cleanup    : dracut-network-033-359.0.1.el7.x86_64                                                                                                8/10 
  Cleanup    : linux-firmware-20150904-43.git6ebf5d5.0.1.el7.noarch                                                                                 9/10 
  Cleanup    : dracut-033-359.0.1.el7.x86_64                                                                                                       10/10 
  Verifying  : dracut-033-360.0.3.el7_2.1.x86_64                                                                                                    1/10 
  Verifying  : dracut-network-033-360.0.3.el7_2.1.x86_64                                                                                            2/10 
  Verifying  : kernel-uek-firmware-4.1.12-61.1.16.el7uek.noarch                                                                                     3/10 
  Verifying  : kernel-uek-4.1.12-61.1.16.el7uek.x86_64                                                                                              4/10 
  Verifying  : dracut-config-rescue-033-360.0.3.el7_2.1.x86_64                                                                                      5/10 
  Verifying  : linux-firmware-20160604-44.git57b649d9.0.2.el7.noarch                                                                                6/10 
  Verifying  : dracut-config-rescue-033-359.0.1.el7.x86_64                                                                                          7/10 
  Verifying  : dracut-033-359.0.1.el7.x86_64                                                                                                        8/10 
  Verifying  : linux-firmware-20150904-43.git6ebf5d5.0.1.el7.noarch                                                                                 9/10 
  Verifying  : dracut-network-033-359.0.1.el7.x86_64                                                                                               10/10 

Installed:
  kernel-uek.x86_64 0:4.1.12-61.1.16.el7uek                                                                                                              

Dependency Installed:
  kernel-uek-firmware.noarch 0:4.1.12-61.1.16.el7uek                                                                                                     

Dependency Updated:
  dracut.x86_64 0:033-360.0.3.el7_2.1                     dracut-config-rescue.x86_64 0:033-360.0.3.el7_2.1 dracut-network.x86_64 0:033-360.0.3.el7_2.1
  linux-firmware.noarch 0:20160604-44.git57b649d9.0.2.el7

Complete!

Generate a new grub.cfg file:

[root@oscsa ~]# grub2-mkconfig > grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.1.12-61.1.16.el7uek.x86_64
Found initrd image: /boot/initramfs-4.1.12-61.1.16.el7uek.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-327.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-327.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-09ec9b0ef1b542bcbde9147e2e5d21e8
Found initrd image: /boot/initramfs-0-rescue-09ec9b0ef1b542bcbde9147e2e5d21e8.img
done

Move the updated grub.cfg file to the grub2 directory:

[root@oscsa ~]# mv grub.cfg /boot/grub2
mv: overwrite ‘/boot/grub2/grub.cfg’? y

We need to disable SELinux in the Host. SELinux is currently not supported and should be disabled.

[root@oscsa grub2]# cat /etc/selinux/config

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of three two values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected. 
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted 

Then we need to reboot the server
[root@oscsa grub2]# reboot

After the reboot, let’s make sure that SELinux is disabled:

[root@oscsa ~]# sestatus
SELinux status:                 disabled

Let’s also make sure that we are booting off the new UEK 4 kernel release:

[root@oscsa ~]# uname -a
Linux oscsa.viscosityna.com 4.1.12-61.1.16.el7uek.x86_64 #2 SMP Fri Oct 21 14:23:20 PDT 2016 x86_64 x86_64 x86_64 GNU/Linux

We need to edit the /etc/yum.repos.d/public-yum-ol7.repo file on the host and enable the channels for adding and optional_latest:
• Change the value of enable to 1 in addons.
• Change the value of enable to 1 in optional_latest.

Here’s what these sections should look like:

[ol7_optional_latest]
name=Oracle Linux $releasever Optional Latest ($basearch)
baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL7/optional/latest/$basearch/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
gpgcheck=1
enabled=1

[ol7_addons]
name=Oracle Linux $releasever Add ons ($basearch)
baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL7/addons/$basearch/
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
gpgcheck=1
enabled=1