Dec 27
Ref: https://www.cs.toronto.edu/~jlucas/teaching/csc411/lectures/lec21_22_handout.pdf
Formulate:
Read more from: https://www.cs.toronto.edu/~jlucas/teaching/csc411/lectures/lec21_22_handout.pdf
What is a Policy (Deterministic Policy, Stochastic Policy)
What is a Value Function
What is a Model? What is Model Free. Markov Property for Model
MDP Problems
Exploration and Exploitation
Bellman Equations
Q-Learning
Function Approximation for Large State Spaces
Dec 27
What is: Reinforcement Learning (Interactive Learning in Decision Processes)?
— Is there a way to learn by interacting
— i.e. interact have experience and use the experience to learn (predict the future)
— Interact to explore and utilize what makes learning (goal/outcome) enhanced
— The computation approach of this method is Reinforcement Learning (Interactive Learning in Decision Processes)?
— it is a goal oriented learning from interactions
— it has it’s root in Markov decision process (MDP)
— Markov decision process (MDP) is a model for sequential decision making when outcomes are uncertain.[1] [Wikipedia]
Reinforcement Learning (Interactive Learning in Decision Processes) Involves:
Markov decision processes
Dynamic Programming
Monte Carlo methods
Temporal-difference learning
Function approximation methods
Monte Carlo methods
Solves problems with repeated random sampling.
Temporal-difference learning: combination of the Monte Carlo (MC) method and the Dynamic Programming (DP) method.
Function approximation methods
Dec 25
From Google (Internet)
https://www.oracle.com/ca-en/database/sqldeveloper
pen-source tools for your Oracle Database setup?
https://www.simplyblock.io/blog/best-open-source-tools-for-oracle-database
Dec 24
The Top 11 Enterprise VPN Solutions Include:
Dec 23
“yum upgrade and yum update will perform the same function that update to the latest current version of package. But the difference is Upgrade will delete obsolete packages, while update will preserve them.Jul 3, 2014”
3.3. UPDATING PACKAGES FROM THE COMMAND LINE WITH YUM
yum install package_name
yum update package_name
yum check-update
yum remove package_name
yum provides package_name
yum search keyword
yum localinstall absolute path to filename
Reference: the above link
Dec 23
Check if your yum server is working or not
yum repolist
yum install tree
yum repolist enabled
yum repolist all
Dec 23
Let FTP work through Firewall
firewall-cmd –add-service=vsftpd –perm
firewall-cmd –add-service=ftp –perm
systemctl reload firewalld
systemctl start firewalld
systemctl enable firewalld
vi /etc/yum.repos.d/local.repo
Dec 23
AutoFS and Mounting in Linux/Redhat/CentOS
echo “AutoFS – Automatic FS system Mounting – Dec 26th, 2017 by Sayed”
check if Autofs installed or not
yum list installed | grep autofs
I just installed; hence it is there
you can install with yum -y install autofs
yum -y install autofs
then you can enable autofs
systemctl status autofs
systemctl start autofs
systemctl enable autofs
enable – will start this service at reboot/system start
AutoFS in general does not use /etc/fstab
AutoFS uses /etc/mtab file
Also, AutoFS has some files under /etc and starting with auto. You can also define which file will contain the mounting mapping. the file that will act like /etc/fstab for autofs
AutoFS has direct mapping and indirect mapping
let’s see some files under /etc for autofs
ls /etc/auto*
The files
/etc/auto.direct /etc/autofs.conf /etc/autofs_ldap_auth.conf /etc/auto.master /etc/auto.misc /etc/auto.net /etc/auto.smb /etc/auto.master.d:
I saw to use /etc/auto.master for configuring which file will do the mapping for direct mounting.
I saw to use /etc/auto.misc for configuring which file will do the mapping for indirect mounting for AutoFS.
One more config file is under: /etc/sysconfig/autofs
cat /etc/sysconfig/autofs
the content
#
#
#
USE_MISC_DEVICE=”yes”
#
#
#
For mounting NFS i.e. remote/network file-systems/folders – we can use the regular mounting i.e. /etc/fstab and mount command. However, that is kinda manual. We can mount NFS using AutoFS that will be automatic mount
We use AutoFS for LDAP clients to auto mount Users’ home directories. We just configure, then the mounting happens automatically. You remember that getent passwd user-name mounted the remote users’ home directory into local system. we used /etc/auto.master to tell that auto.guests will have the mounting configurations. then on /etc/auto.guests file – we configured that users’ home directories will be mounted on /home/guests. you can check our notes on LDAP client configuration
cat /etc/auto.master
vim /etc/auto.master
we added the following line on /etc/auto.master
/etc/auto.guests /etc/auto.direct
it just tells that AutoFS will consult /etc/auto.guests file for direct mapping
vim /etc/auto.guests
we added the following line on /etc/auto.guests
/home/guests 192.168.1.15:/nfsrh
it just tells remote /nfsrh will be automatically mounted to /home/guests
you can try to restart autofs
systemctl restart autofs
Indirect Map
indirectly mounted points are only visible when accessed
automatically mounts shares under one common parent directory
each indirect map put only one entry in the mtab file
local and indirect maps cannot exist in the same parent directory
for indirect mapping – you use /etc/auto.misc file From: http://sitestree.com/?p=12070
Categories:DevOps, RHCSA
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Post Data:2017-12-26 15:27:27
