ソフトウェアエンジニアの技術ブログ：Software engineer tech blog – Page 371 – 随机应变 ABCD: Always Be Coding and … : хороший

httpd.conf error log

path: /etc/httpd/conf

ErrorLog logs/error_log

Set the log output destination in error_log of php.ini.
When describing the file name, write it with absolute path.

Log output with php

To display as HTML on the web, specify the log output level and turn on the log display setting.

display_errors = Off

To keep it in the file, set log_errors.

log_errors = On

Centralized log service configuration settingss

Log type
The logs are not all the same, but the purpose are different depending on the type.
– application log
– accessibility log
– security log
– other

Overall view of log processing
– collect: AmazonS3, Amazon Kinesis, Amazon DynamoDB, Amazon RDS(Aurora)
– process: AWS Lambda, KCL Apps
– analyze: Amazon EMR
– save: Amazon Redshift, Amazon Machine Learning

Logs output from AWS services
Log specific to each environment such as OS and application

VirtualBox(Oracle VM VirtualBox) VBoxManage

VBoxManage Introduction
https://www.virtualbox.org/manual/ch08.html#idm3663

As briefly mentioned in Section 1.17, “Alternative Front-Ends”, VBoxManage is the command-line interface to Oracle VM VirtualBox. With it, you can completely control Oracle VM VirtualBox from the command line of your host operating system. VBoxManage supports all the features that the graphical user interface gives you access to, but it supports a lot more than that. It exposes all the features of the virtualization engine, even those that cannot be accessed from the GUI.

Display a list of virtual machines created by VirutalBox.

VBoxManage list vms

create virtual machine name
specify the virtual machine name to create the VirualBox configuration file.

VBoxManage createvm --name CentOS-6.4-x86_64-minimal

Virtual Machine Settings
Registered the virtual machine, there is nothing set up for the virtual machine, so set up the virtual machine.
In addition to the specifications of the above virtual machines, the clipboard sharing is specified bidirectionally, and the boot order is changed from HDD to DVD to NET here.

VBoxManage modifyvm CentOS-6.4-x86_64-minimal --ostype RedHat_6

Create a virtual hard disk
Create a virtual hard disk with a fixed size. Although you can specify an arbitrary folder with the -filename option, it is created by specifying the folder to save the VirtualBox.

VBoxManage createhd --size 8192 --variant Fixed --filename F:/VirtualBox/CentOS-6.4-x86_64-minimal/CentOS-6.4-x86_64-minimal.vdi

Add storage controller
Add a SATA(Serial ATA) controller to assign virtual hard disk and virutal DVD drive. In addition to sata, ide / sscsi / floppy can be specified. Also, by specifying -bootable on, it is set as a Bootable controller.

$ VBoxManage storagectl CentOS-6.4-x86_64-minimal --name SATA --add sata --sataportcount 5 --bootable on

Assign virtual hard disk
After adding the storage controller, assign the virtual hard disk by specifying the name of the added storage controller.

VBoxManage storageattach CentOS-6.4-x86_64-minimal --storagectl SATA --port 1 --type hdd --medium F:/VirtualBox/CentOS-6.4-x86_64-minimal/CentOS-6.4-x86_64-minimal.vdi

Assign virtual DVD drive
Like the virtual hard disk, assign a virtual DVD drive. The installation media specifies CentOs – 6.4 x86 – 64 minimal .iso.

$ VBoxManage storageattach CentOS-6.4-x86_64-minimal --storagectl SATA --port 2 --type dvddrive --medium I:/ISO/CentOS/CentOS-6.4-x86_64-minimal.iso

Starting a virtual machine
Now that the setting of the virtual machine has been completed, start the virutal machine.

VBoxManage startvm CentOS-6.4-x86_64-minimal

ln -s

[vagrant@localhost tests]$ ls
index.php  test
[vagrant@localhost tests]$ cat index.php
<?php

?>
<!DOCTYPE html>
<html>
<head>
        <meta charset="UTF-8">
        <script src="tinymce/js/tinymce/tinymce.min.js"></script>
        <script>
                tinymce.init({
                        selector:"#tiny",
                        // menubar: false,
                        plugins: "textcolor image link",
                        toolber: [
                                "undo redo | formatselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent",
                                "fontsizeselect forecolor image link"
                        ],
                        statusbar: false,
                });
        </script>
</head>
<body>
        <textarea id="tiny" name=""></textarea>
</body>
</html>

[vagrant@localhost tests]$ ln -s index.php copy
[vagrant@localhost tests]$ ls
copy  index.php  test
[vagrant@localhost tests]$ cat copy
<?php

?>
<!DOCTYPE html>
<html>
<head>
        <meta charset="UTF-8">
        <script src="tinymce/js/tinymce/tinymce.min.js"></script>
        <script>
                tinymce.init({
                        selector:"#tiny",
                        // menubar: false,
                        plugins: "textcolor image link",
                        toolber: [
                                "undo redo | formatselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent",
                                "fontsizeselect forecolor image link"
                        ],
                        statusbar: false,
                });
        </script>
</head>
<body>
        <textarea id="tiny" name=""></textarea>
</body>
</html>

すげーーーーーーー linux

rm -rf ${dir_name | file name}

-r
This is used to delete directories. Even if there is a directory in the directory, all deletion will be done.

-f
It is ok to delete the file on linux without confirmation. For example, when deleting a large number of files, it is commonly used option when it is troublesome to check each time. Also, no warning will be issued even if the file does not exist.

[vagrant@localhost tests]$ ls
dmm index.php test
[vagrant@localhost tests]$ rm -rf dmm
[vagrant@localhost tests]$ ls
index.php test

chown -R ${dir_name}

Check the permission with the “ll” command.

[vagrant@localhost tests]$ ll
合計 12
drwxr-xr-x 2 vagrant vagrant 4096 2月 17 14:36 2019 dmm
-rw-rw-r– 1 vagrant vagrant 551 2月 10 11:26 2019 index.php
drwxr-xr-x 4 vagrant vagrant 4096 2月 15 08:53 2019 test
[vagrant@localhost tests]$ cd dmm
[vagrant@localhost dmm]$ ll
合計 0
-rw-rw-r– 1 vagrant vagrant 0 2月 17 14:36 2019 dmm.txt

drwxr-xr-x is 755
-rw-rw-r– is 644

[vagrant@localhost tests]$ chmod -R 764 dmm
[vagrant@localhost tests]$ ll
合計 12
drwxrw-r– 2 vagrant vagrant 4096 2月 17 14:36 2019 dmm
-rw-rw-r– 1 vagrant vagrant 551 2月 10 11:26 2019 index.php
drwxr-xr-x 4 vagrant vagrant 4096 2月 15 08:53 2019 test
[vagrant@localhost tests]$ cd dmm
[vagrant@localhost dmm]$ ll
合計 0
-rwxrw-r– 1 vagrant vagrant 0 2月 17 14:36 2019 dmm.txt

tail -f ${file_name}

originally tail is a command to display the last 10 lines(default) of the file.
As a command to be paired there is head, display the top 10 lines of the file. To change the number of lines to display, specify the number of lines with the -n option for both commands.

First i will make a sample file of 26 lines.

[vagrant@localhost tests]$ tail test.txt
 -数字表記-
 0     ---
 1     --x
 2     -w-
 3     -wx
 4     r--
 5     r-x
 6     rw-
 7     rwx
※2進数に直した3bitに当てはめる。

[vagrant@localhost tests]$ tail -n 3 test.txt
 6     rw-
 7     rwx
 ※2進数に直した3bitに当てはめる。

tail -n
Even if it is displayed to the end of the file, it does not end and when the end of the file is updated, the addition is displayed continuously.

add new line

command line automatically updated.

こりゃ驚いた

cp -r ${dir_name}

The cp command on Unix/linux is a command to copy files and directories. Since the cp command has existed for a long time(it appeared in the first Unix V1), it can be used with any UNIX/Linux OS.

option
-R : copy directory recursively

[vagrant@localhost tests]$ ls
index.php test
[vagrant@localhost tests]$ cp -r test test2
[vagrant@localhost tests]$ ls
index.php test test2

すげーーーーーー