How to Install Squid (Caching / Proxy) on CentOS 7

Squid is a caching and forwarding web proxy. It is most often used in conjunction with a traditional LAMP stack (Linux, Apache, MySQL, PHP), and can be used to filter traffic on HTTP, FTP, and HTTPS, and increase the speed (thus lower the response time) for a web server via caching.

Pre-Flight Check
These instructions are intended specifically for installing Squid on a single CentOS 7 node.
I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.

Step #1 Install Squid
First, clean-up yum:

yum clean all

As a matter of best practice we’ll update our packages:

yum -y update

Installing Squid and related packages is now as simple as running just one command:

yum -y install squid

Configure Squid to Start on Boot
And then start Squid:

systemctl start squid

Be sure that Squid starts at boot:

systemctl enable squid

To check the status of Squid:

systemctl status squid

To stop Squid:

systemctl stop squid

To access squid settings access : /etc/squid/

My basic config:

http_access allow localhost manager
http_access deny manager

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost


# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost

# And finally deny all other access to this proxy
http_access deny all

# Squid normally listens to port 3128
http_port 3128

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 10000 16 256
cache_replacement_policy heap LFUDA
cache_swap_low 90
cache_swap_high 95
maximum_object_size_in_memory 100 MB
cache_dir aufs /var/spool/squid 40000 16 256
cache_mem 40000 MB

# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid

# Add any of your own refresh_pattern entries above these.

That is all!

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How to configure Btrfs on Centos 7

Check unit to add

#fdisk -l


Selecione o disco
Disk /dev/sdb: 17.2 GB, 17179869184 bytes, 33554432 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Adding partition:

#fdisk /dev/sdb
# M – “Show all options available”
# P – “Type ” p” to display information on the disc as the current partitions”
# n – “Show all options available”
# p – “primary partition”
# 1 – “Partition number 1”
# enter – “default”
# enter – “default”
# w “List unit”

Check unit created

# fdisk -l

Check BTRFS Version and Installation

#yum search btrfs
#yum install btrfs-progs.x86_64

FSTAB access the file and add the mount point and compression

#vim /etc/fstab

Add the following line:

/dev/sdb1 /opt btrfs compress=zlib,compress-force=zlib 1 1

Assembling Compression :

#mkfs.btrfs /dev/sdb1 -f

Restart the machine and starting from this moment the unit / opt ‘ll be using btrfs to compress the files.

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