구차니의 잡동사니 모음

2.4 Helper Multiplexer

The helper multiplexer's purpose is to relieve some of the burden Squid has when dealing with slow helpers. It does so by acting as a middleman between squid and the actual helpers, talking to Squid via the multiplexed concurrent variant of the helper protocol and to the helpers via the non-concurrent variant.

Helpers are started on demand, and in theory the muxer can handle up to 1k helpers per instance. It's up to squid to decide how many helpers to start.

The muxer knows nothing about the actual messages being passed around, and as such can't really (yet?) compensate for broken helpers. It is not yet able to manage dying helpers, but it will.

To configure the multiplexer add its binary name (usually /usr/share/libexec/helper-mux.pl) in front of the name of whichever helper is being multiplexed. It takes the helper binary path and parameters as its own command parameters. The concurrency setting already existing in Squid is used to configure how many child helpers it may run.

For example, a traditional configuration is

        url_rewrite_program /your/redirector.sh
        url_rewrite_children 5
   

        url_rewrite_program /usr/share/libexec/helper-mux.pl /your/redirector.sh
        url_rewrite_children 1 concurrency=5
   

Helpers which are already concurrent protocol enabled gain little benefit from the multiplexer on most systems. However on some systems where Squid spawning helpers causes excess memory usage the reduction in direct helper spawned by Squid can result in a great reduction in resource use.

The helper can be controlled using various signals:

• SIGHUP: dump the state of all helpers to STDERR

 # OPTIONS FOR URL REWRITING

# -----------------------------------------------------------------------------

#  TAG: storeurl_rewrite_program
#	Specify the location of the executable for the Store URL rewriter.
#	The Store URL rewriter allows URLs to be "normalised" ; mapping
#	multiple URLs to a single URL representation for cache operations.
#
#	For example, if you request an object at:
#
#	http://srv1.example.com/image.gif
#
#	and a subsequent request for:
#
#	http://srv2.example.com/image.gif
#
#	then Squid will treat these both as different URLs and cache them
#	seperately.
#
#	This is almost the normal case, but an increasing number of sites
#	distribute the same content between multiple frontend hosts.
#	The Store URL rewriter allows you to rewrite these URLs to one URL
#	to use for cache operations, but not -fetches-. Fetches are still
#	made from the original site, but stored with the store URL rewritten
#	URL as the store key.
#
#	For each requested URL rewriter will receive on line with the format
#
#	URL <SP> client_ip "/" fqdn <SP> user <SP> method <SP> urlgroup
#	 [<SP> kvpairs] <NL>
#
#	In the future, the rewriter interface will be extended with
#	key=value pairs ("kvpairs" shown above).  Rewriter programs
#	should be prepared to receive and possibly ignore additional
#	whitespace-separated tokens on each input line.
#
#	And the rewriter may return a rewritten URL. The other components of
#	the request line does not need to be returned (ignored if they are).
#
#	By default, a Store URL rewriter is not used.
#
#	Please note - the normal URL rewriter rewrites Squid's _destination_
#	URL - ie, what it fetches. The Store URL rewriter rewrites Squid's
#	_store_ URL - ie, what it uses to store and retrieve objects.
#
#Default:
# none

#  TAG: url_rewrite_program
#	Specify the location of the executable for the URL rewriter.
#	Since they can perform almost any function there isn't one included.
#
#	For each requested URL rewriter will receive on line with the format
#
#	URL <SP> client_ip "/" fqdn <SP> user <SP> method <SP> urlgroup
#	 [<SP> kvpairs] <NL>
#
#	In the future, the rewriter interface will be extended with
#	key=value pairs ("kvpairs" shown above).  Rewriter programs
#	should be prepared to receive and possibly ignore additional
#	whitespace-separated tokens on each input line.
#
#	And the rewriter may return a rewritten URL. The other components of
#	the request line does not need to be returned (ignored if they are).
#
#	The rewriter can also indicate that a client-side redirect should
#	be performed to the new URL. This is done by prefixing the returned
#	URL with "301:" (moved permanently) or 302: (moved temporarily).
#
#	It can also return a "urlgroup" that can subsequently be matched
#	in cache_peer_access and similar ACL driven rules. An urlgroup is
#	returned by prefixing the returned URL with "!urlgroup!".
#
#	By default, a URL rewriter is not used.
#
#Default: 

# none 

# yum install postgresql  postgresql-server 

# service postgresql initdb

$ su -l postgres -c "initdb -E UTF8 --locale=ko_KR.UTF-8 --locale=en_US.utf8"

# chkconfig postgresql on 

# systemctl start postgresql 

# sudo -i -u postgres

# psql

postgres=# create user [계정아이디] with password '';

postgres=# create database [데이터베이스 이름];

postgres=# \q

# exit

sudo -u postgres psql postgres

# \password postgres

Enter new password:  

postgres=# ALTER USER postgres WITH PASSWORD ''; 

# vim /var/lib/pgsql/data/pg_hba.conf

host all all      ::1/128      trust

host all postgres 127.0.0.1/32 trust 

# vim /var/lib/pgsql/data/pg_hba.conf 

listen_addresses = '*'

// 홈페이지 1

    server {

        listen       80;

        server_name domain.co.kr www.domain.co.kr;

        location / {

                proxy_pass http://localhost:20000/;

                proxy_set_header X-Real-IP $remote_addr;

                proxy_set_header Host $host;

                proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;

        }

    }

// 홈페이지 2, 특정 하위 주소에 다른 서비스를 연결함

    server {

        listen       80;

        server_name domain2.co.kr www.domain2.co.kr;

        location / {

                proxy_pass http://localhost:30000/;

                proxy_set_header X-Real-IP $remote_addr;

                proxy_set_header Host $host;

                proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;

        }

        location /sub1 {

                proxy_pass http://localhost:40000/;

                proxy_set_header X-Real-IP $remote_addr;

                proxy_set_header Host $host;

                proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;

        }

    }

// 다른 서비스로 연결되는 녀석을 서브 도메인으로 연결

    server {

        listen       80;

        server_name sub1.domain2.co.kr;

        location / {

                proxy_pass http://localhost:40000/;

                proxy_set_header X-Real-IP $remote_addr;

                proxy_set_header Host $host;

                proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;

        }

    } 

// 홈페이지 3, 서비스를 서브 도메인으로도 연결

    server {

        listen       80;

        server_name sub2.domain2.co.kr;

        location / {

                proxy_pass http://localhost:50000/;

                proxy_set_header X-Real-IP $remote_addr;

                proxy_set_header Host $host;

                proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;

        }

    }

pvchange   pvck       pvcreate   pvdisplay  pvmove     pvremove   pvresize   pvs        pvscan 

lvchange     lvcreate     lvextend     lvmconf      lvmdiskscan  lvmetad      lvmsadc      lvreduce     lvrename     lvs

lvconvert    lvdisplay    lvm          lvmconfig    lvmdump      lvmpolld     lvmsar       lvremove     lvresize     lvscan 

vgcfgbackup    vgck           vgdisplay      vgimport       vgmknodes      vgrename       vgsplit

Use vgcreate(8) to create a new VG on the PV, or vgextend(8) to add the PV to existing VG. 

mount: /home/test does not contain SELinux labels.

       You just mounted an file system that supports labels which does not

       contain labels, onto an SELinux box. It is likely that confined

       applications will generate AVC messages and not be allowed access to

       this file system.  For more details see restorecon(8) and mount(8).

# restorecon -Rv /raid1

# fixfiles relabel 

# yum install system-storage-manager 

# ssm list

-------------------------------------------------------------

Device        Free       Used      Total  Pool    Mount point

-------------------------------------------------------------

/dev/sda                       465.25 GB          PARTITIONED

/dev/sda1                        1.00 GB          /boot

/dev/sda2  4.00 MB  464.24 GB  464.25 GB  centos

/dev/sdb                         4.36 TB

/dev/sdb1  0.00 KB    4.36 TB    4.36 TB  centos

-------------------------------------------------------------

------------------------------------------------

Pool    Type  Devices     Free     Used    Total

------------------------------------------------

centos  lvm   2        4.00 MB  4.82 TB  4.82 TB

------------------------------------------------

--------------------------------------------------------------------------------------

Volume             Pool    Volume size  FS     FS size       Free  Type    Mount point

--------------------------------------------------------------------------------------

/dev/centos/root   centos     50.00 GB  ext4  50.00 GB   43.00 GB  linear  /

/dev/centos/swap   centos     31.44 GB                             linear

/dev/centos/samba  centos      4.74 TB  ext4   4.74 TB    4.46 TB  linear  /home/samba

/dev/sda1                      1.00 GB  ext4   1.00 GB  787.87 MB  part    /boot

--------------------------------------------------------------------------------------

 # df -h

Filesystem                Size  Used Avail Use% Mounted on

/dev/mapper/centos-root    50G  4.3G   43G  10% /

devtmpfs                   32G     0   32G   0% /dev

tmpfs                      32G     0   32G   0% /dev/shm

tmpfs                      32G   11M   32G   1% /run

tmpfs                      32G     0   32G   0% /sys/fs/cgroup

/dev/sda1                 976M  150M  760M  17% /boot

/dev/mapper/centos-samba  4.8T   89M  4.5T   1% /home/samba

tmpfs                     6.3G     0  6.3G   0% /run/user/0

tmpfs                     6.3G  4.0K  6.3G   1% /run/user/42

tmpfs                     6.3G   44K  6.3G   1% /run/user/1000 

# lvdisplay

  --- Logical volume ---

  LV Path                /dev/centos/samba

  LV Name                samba

  VG Name                centos

  LV UUID                9Aa0oO-Ndwh-5IfX-O5vW-KZ8Z-tAFF-RBcKLq

  LV Write Access        read/write

  LV Creation host, time localhost, 2019-03-05 10:32:46 +0900

  LV Status              available

  # open                 1

  LV Size                <4.74 TiB

  Current LE             1242061

  Segments               2

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     256

  Block device           253:2

  --- Logical volume ---

  LV Path                /dev/centos/swap

  LV Name                swap

  VG Name                centos

  LV UUID                uYmqZR-s3FZ-w56s-97cm-eaYn-Vj6Y-SEvcWS

  LV Write Access        read/write

  LV Creation host, time localhost, 2019-03-05 10:32:50 +0900

  LV Status              available

  # open                 2

  LV Size                <31.44 GiB

  Current LE             8048

  Segments               1

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     256

  Block device           253:1

  --- Logical volume ---

  LV Path                /dev/centos/root

  LV Name                root

  VG Name                centos

  LV UUID                8PH4I2-Amfo-YuDh-J9h5-Hwhq-jSjZ-MrEUNK

  LV Write Access        read/write

  LV Creation host, time localhost, 2019-03-05 10:32:50 +0900

  LV Status              available

  # open                 1

  LV Size                50.00 GiB

  Current LE             12800

  Segments               1

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     256

  Block device           253:0

# pvdisplay

  --- Physical volume ---

  PV Name               /dev/sda2

  VG Name               centos

  PV Size               <464.25 GiB / not usable 3.00 MiB

  Allocatable           yes

  PE Size               4.00 MiB

  Total PE              118847

  Free PE               1

  Allocated PE          118846

  PV UUID               bxRHju-AXnI-7xwe-MEo5-LNWq-A0tw-VngA83

  --- Physical volume ---

  PV Name               /dev/sdb1

  VG Name               centos

  PV Size               4.36 TiB / not usable 2.00 MiB

  Allocatable           yes (but full)

  PE Size               4.00 MiB

  Total PE              1144063

  Free PE               0

  Allocated PE          1144063

  PV UUID               Z2jJnF-h4Uu-T0gF-yKyb-jSat-wPMr-7j2RtC