NextCloudBackup/README.md

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# NextCloud Backup Using borgbackup <!-- omit in toc -->
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This script automates backing up your NextCloud installation using borgbackup
and a remote ssh-capable storage system. I suggest using rsync.net since they
have great speeds and a special pricing structure for borgbackup/attic users
([details here](https://www.rsync.net/products/attic.html)).
This script automates the following tasks:
- Optionally copies a 503 error page to your webserver so users know when your
server is unavailable due to backups being performed. The 503 file is removed
when the backup is completed so users can login again
- Dumps the NextCloud mySQL database and adds it to the backup
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- Handles entering and exiting NextCloud's maintenance mode to 'lock' accounts
so changes are not made during the backup process
- Allows you to specify additional files you want backed up
- Allows you to specify files/directories to exclude from your backups (e.g.
previews)
- Runs 'borg prune' to make sure you are trimming old backups on your schedule
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- Creates a clear, easy to parse log file so you can keep an eye on your backups
and any errors/warnings
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## Contents <!-- omit in toc -->
- [Installation/copying](#installationcopying)
- [Environment notes](#environment-notes)
- [Why this script must be run as root](#why-this-script-must-be-run-as-root)
- [Script parameters](#script-parameters)
- [Required parameters](#required-parameters)
- [NextCloud data directory: -d _/path/to/data/_](#nextcloud-data-directory--d-pathtodata)
- [NextCloud webroot: -n _/path/to/nextcloud/_](#nextcloud-webroot--n-pathtonextcloud)
- [webuser account: -w _accountName_](#webuser-account--w-accountname)
- [Optional parameters](#optional-parameters)
- [Path to 503 error page: -5 _/path/to/filename.html_](#path-to-503-error-page--5-pathtofilenamehtml)
- [Path to borg details file: -b _/path/to/filename.file_](#path-to-borg-details-file--b-pathtofilenamefile)
- [Desired log file location: -l _/path/to/filename.file_](#desired-log-file-location--l-pathtofilenamefile)
- [Path to SQL details file: -s _/path/to/filename.file_](#path-to-sql-details-file--s-pathtofilenamefile)
- [Verbose output from borg: -v (no arguments)](#verbose-output-from-borg--v-no-arguments)
- [Path to webroot: -w _/path/to/webroot/_](#path-to-webroot--w-pathtowebroot)
- [Borg details file](#borg-details-file)
- [Protect your borg details file](#protect-your-borg-details-file)
- [borg specific entries (lines 1-4)](#borg-specific-entries-lines-1-4)
- [Line 1: Path to borg base directory](#line-1-path-to-borg-base-directory)
- [Line 2: Path to SSH key for remote server](#line-2-path-to-ssh-key-for-remote-server)
- [Line 3: Connection string to remote repo](#line-3-connection-string-to-remote-repo)
- [Line 4: Password for borg repo/repo key](#line-4-password-for-borg-reporepo-key)
- [additional files/directories to backup](#additional-filesdirectories-to-backup)
- [exclusion patterns](#exclusion-patterns)
- [prune timeframe options](#prune-timeframe-options)
- [borg remote location](#borg-remote-location)
- [Examples](#examples)
- [SQL details file](#sql-details-file)
- [Protect your sql details file](#protect-your-sql-details-file)
- [503 functionality](#503-functionality)
- [Conditional forwarding by your webserver](#conditional-forwarding-by-your-webserver)
- [NGINX](#nginx)
- [Apache](#apache)
- [Disabling 503 functionality altogether](#disabling-503-functionality-altogether)
- [Scheduling: Cron](#scheduling-cron)
- [The log file](#the-log-file)
- [Using Logwatch](#using-logwatch)
- [Remember to rotate your logs](#remember-to-rotate-your-logs)
- [Final notes](#final-notes)
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## Installation/copying
Once you've either cloned this git or downloaded the release file, simply copy
the *'NCscripts'* folder to wherever you like. I suggest putting it in your
*'/root'* directory since the root user must execute the script. If you edit
the 503.html, nc_borg.details and nc_sql.details files in place, then you don't
have to specify their locations when running the script.
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Remember to make the script executable!
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```Bash
chmod +x backup.sh
```
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In addition, you can rename the script file to anything you like. The log file
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will use that same name by default when naming itself and any mention of this
file in the logs will automatically use whatever name you choose to give it.
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## Environment notes
The script is designed to be easy to use but still be flexible enough to
accommodate a wide range of NextCloud setups. I have tested it with NextCloud
13 and 14 using a standard LEMP setup (Debian Stretch, NGINX, mariaDB & PHP7).
The script accepts several parameters to provide it with the settings it
requires to function. In addition, it reads external plain-text files for SQL
and borg settings so you don't have to weed through the script code to supply
things like passwords.
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## Why this script must be run as root
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This script must be run by the root user and will exit with an error if you try
running it otherwise. This is because NextCloud's OCC command (needed to put
NextCloud into maintenance mode) must be run as the web-user account and only
the root account can switch users without needing to stop and ask for
permission/passwords.
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## Script parameters
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You can run the script with the *'-?'* parameter to access the built-in help
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which explains the parameters. However, the following is a more detailed
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explanation of each parameter and how to use them.
**Note that any parameters needing a directory (webroot, nextcloud root, etc.)
can be entered with or without the trailing '/' since it's stripped by the script
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anyways.**
General usage:
```Bash
/path/to/script/scriptname.sh -parameter argument -parameter argument ...
```
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### Required parameters
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#### NextCloud data directory: -d _/path/to/data/_
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This is the full path to the location where NextCloud actually stores data. In
a setup such as I recommend on my blog at
[https://mytechiethoughts.com](https://www.mytechiethoughts.com), you would be
using an entry such as *'/var/nc_data'*. This directory and all subdirectories
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are automatically included in the backup.
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#### NextCloud webroot: -n _/path/to/nextcloud/_
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This is the directory in which NextCloud's php and html files are located. It
is generally somewhere under your webroot directory. This is required so the
script can find the 'OCC' command to invoke maintenance mode.
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#### webuser account: -w _accountName_
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This is the account that NextCloud runs under via your webserver. This is
almost always *'www-data'*. You would have to check your NGINX/Apache config to
be sure. 'OCC' will not run as any other user thus, the script cannot
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enter/exit maintenance mode without knowing which user to emulate.
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### Optional parameters
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#### Path to 503 error page: -5 _/path/to/filename.html_
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The path to an html file for the script to copy to your webroot during the
backup process. This file can be scanned by your webserver and a 503 error can
be issued to users letting them know that your NextCloud is 'temporarily
unavailable' while being backed up. A sample 503 page is included for you.
If you remove the default file or the one you specify is missing, a warning will
be issued by the script but, it will continue executing. More details on the
503 notification can be found later in the [503 functionality](#503-functionality) section of this
document.\
**Default: _scriptpath/503.html_**
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#### Path to borg details file: -b _/path/to/filename.file_
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This is a text file that lays out various borg options such as repo name,
password, additional files to include, exclusion patters, etc. A sample file is
included for your reference. More details, including the *required order* of
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entries can be found later in this document in the [borg details file](#borg-details-file)
section.\
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**Default: _scriptpath/nc_borg.details_**
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#### Desired log file location: -l _/path/to/filename.file_
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If you have a particular place and filename you'd like this script to use for
it's log, then you can specify it using this parameter. I would recommend
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*'/var/log/backup.log'*. By default, the script will name the log file
*scriptname*.log and will save it in the same directory as the script itself.\
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**Default: _scriptpath/scriptname.log_**
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#### Path to SQL details file: -s _/path/to/filename.file_
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This is a text file containing the details needed to connect to NextCloud's SQL
database. More information about the *required order* of entries can be found
later in this document in the [sql details file](#sql-details-file) section.\
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**Default: _scriptpath/nc_sql.details_**
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#### Verbose output from borg: -v (no arguments)
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By default, the script will ask borg to generate summary only output and record
that in the script's log file. If you are running the backup for the first time
or are troubleshooting, you may want a detailed output of all files and their
changed/unchanged/excluded status from borg. In that case, specify the -v
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switch. **Note: This will make your log file very large very quickly since EVERY
file being backed up is written to the log.**
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#### Path to webroot: -w _/path/to/webroot/_
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This is the path to the directory your webserver is using as it's default root.
In other words, this is the directory that contains the html files served when
someone browses to your server. Depending on your setup, this might be the same
as your NextCloud webroot.
This is used exclusively for 503 functionality since the script has to know
where to copy the 503 file. If you don't want to use this functionality, you
can omit this parameter and the script will issue a warning and move on. More
details can be found in the [503 functionality](#503-functionality) section later in this
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document.
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## Borg details file
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This file contains all the data needed to access your borg remote data repo.
Each line must contain specific information in a specific order or *needs to be
blank if that data is not required*. The sample file includes this data and
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example entries. The file must have the following information in the following
order:
1. path to borg base directory **(required)**
2. path to ssh private key for remote server **(required)**
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3. connection string to remote repo **(required)**
4. password for borg repo/repo key **(required)**
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5. path to file listing additional files/directories to backup
6. path to file containing borg-specific exclusion patterns
7. prune timeframe options
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8. location of borg remote instance
### Protect your borg details file
This file contains information on how to access and decrypt your borg repo,
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therefore, you **must** protect it. You should lock it out for everyone but
your root user. Putting it in your root folder is not enough! Run the following
commands to restrict access to the root user only (assuming filename is
*'nc_borg.details'*):
```Bash
chown root:root nc_borg.details # make root the owner
chmod 600 nc_borg.details # restrict access to root only (read/write)
```
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### borg specific entries (lines 1-4)
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If you need help with these options, then you should consult the borg
documentation or search my blog at
[https://mytechiethoughts.com](https://mytechiethoughts.com) for borg. Here's a
very brief overview:
#### Line 1: Path to borg base directory
This is primary directory on your local system where your borg configuration is
located, **NOT* the path to your borg binary. The base directory contains the
borg configuration, cache, security files and keys.
#### Line 2: Path to SSH key for remote server
This is the SSH key used to connect to your remote (backup) server where your
borg repo is located. **This is NOT your borg repo key!**
> Please note: If you are planning on executing this script via cron or some
> other form of automation, it is *highly recommended* that you use an SSH key
> **without** a password! SSH is designed such that passwords cannot simply be
> passed to it via environment variables, etc. so this is something not easily
> automated by a script such as this for security reasons. As such, your
> computer will sit and wait for you to enter the password and will NOT execute
> the actual backup portion of the script until the SSH key password is provided.
>
> If you really want/need to use an SSH key password, you will have to look into
> somethign like GNOME keyring or SSH-agent to provide a secure automated way to
> provide that password to SSH and allow this script to continue.
>
> In practice, SSH keys without passwords are still quite safe since the key
> must still be known in order to connect and most keys are quite long. In
> addition, they key only connects to the remote server, your actual information
> within the borg repository is still encrypted and secured with both a key and
> password.
#### Line 3: Connection string to remote repo
This is the full server and path required to connect to your borg repo on the
remote server. Very often it is the in the form of:
```
user@servername.tld:repo-name/
```
for rsync.net it is in the following form:
```
username@server-number.rsync.net:repo-name/
```
#### Line 4: Password for borg repo/repo key
This is the password needed to access and decrypt your *borg repo*. Assuming
you set up your borg repo using recommended practices, this will actually be the
password for your *borg repo private key*. **This is NOT your SSH key
password!**
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### additional files/directories to backup
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This points to a plain-text file listing additional files and directories you'd
like borg to include in the backup. The sample file, *'xtraLocations.borg'*
contains the most likely files you'd want to include assuming you're using a
standard setup like it outline in my blog.
The following would include all files in the home folder for users *'foo'* and
*'bar'* and any conf files in *'/etc/someProgram'*:
```Bash
/home/foo/
/home/bar/
/etc/someProgram/*.conf
```
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You can leave this line blank to tell borg to only backup your NextCloud data
directory and the SQL dump. However, this is pretty unusual since you would not
be including any configuration files, webserver configurations, etc. If you
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omit this line, the script will log a warning to remind you of this unusual
situation.
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### exclusion patterns
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This points to a plain-text file containing borg-specific patterns describing
what files you'd like borg to ignore during the backup. The sample file,
*'excludeLocations.borg'* contains a list of directories to exclude assuming a
standard NextCloud install -- the previews directory and the cache directory.
You need to run *'borg help patterns'* for help on how to specify any additional
exclusion patterns since the format is not standard BASH format and only
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sometimes uses standard regex.
If you leave this line blank, the script will note it is not processing any
exclusions and will proceed with backing up all files specified.
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### prune timeframe options
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Here you can let borg prune know how you want to manage your backup history.
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Consult the borg documentation and then copy the relevant options directly into
this line including any spaces, etc. The example file contains the following as
a staring point:
```Ini
--keep-within=7d --keep-daily=30 --keep-weekly=12 --keep-monthly=-1
```
This would tell borg prune to keep ALL backups made for any reason within the
last 7 days, keep 30 days worth of daily backups, 12 weeks of end-of-week
backups and then an infinite amount of end-of-month backups.
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### borg remote location
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If you're using rsync, then just have this say *'borg1'*. If you are using
another provider, you'll have to reference their locally installed copy of borg
relative to your home directory. You can also leave this blank if your provider
does not run borg locally but your backups/restores will be slower.
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### Examples
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Repo in directory *'NCBackup'*, all fields including pointers to additional
files to backup, exclusion patterns and a remote borg path. Prune: keep all
backups made in the last 14 days.
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```Ini
/var/borgbackup
/var/borgbackup/SSHprivate.key
myuser@usw-s001.rsync.net:NCBackup/
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myPaSsWoRd
/root/NCscripts/xtraLocations.borg
/root/NCscripts/excludeLocations.borg
--keep-within=14d
borg1
```
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Repo in directory *'myBackup'*, no exclusions, keep 14 days end-of-day, 52 weeks
end-of-week
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```Ini
/var/borgbackup
/root/keys/rsyncPrivate.key
myuser@usw-s001.rsync.net:myBackup/
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PaSsWoRd
/var/borgbackup/include.list
--keep-daily=14 --keep-weekly=52
borg1
```
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Repo in directory *'backup'*, no extra file locations, no exclusions, no remote
borg installation. Keep last 30 backups.
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```Ini
/root/.borg
/root/.borg/private.key
username@server.tld:backup/
pAsSw0rD
--keep-within=30d
```
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**Notice that the blank lines are very important!**
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## SQL details file
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This file contains all the information needed to access your NextCloud SQL
database in order to dump it's contents into a file that can be easily
backed-up. Each line must contain specific information in a specific order. The
sample file includes this data and example entries. The file must have the
following information in the following order (**all entries required**):
1. name of machine hosting mySQL (usually localhost)
2. name of authorized user
3. password for above user
4. name of NextCloud database
For example:
```Ini
localhost
nextcloud
pAsSwOrD
nextcloudDB
```
### Protect your sql details file
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This file contains information on how to access your SQL installation therefore,
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you **must** protect it. You should lock it out for all users except root.
Putting it in your root folder is not enough! Run the following commands to
restrict access to the root user only (assuming filename is *'nc_sql.details'*):
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```Bash
chown root:root nc_sql.details # make root the owner
chmod 600 nc_sql.details # restrict access to root only (read/write)
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```
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## 503 functionality
This script includes an entire section dedicated to copying an html file to act
as an error 503 notification page. Error 503 is by definition "service
temporarily unavailable" which is exactly the case for your NextCloud server
during a backup since it is in maintenance mode and no logins are permitted.
The script copies whatever file is defined by the *'-5'* parameter (or the
default located at *'scriptpath/503.html'*) to whatever path is defined as the
'webroot' by the *'-w'* parameter. This means that if you omit the *'-w'*
parameter, the script will necessarily skip this entire process and just issue a
warning to let you know about it.
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### Conditional forwarding by your webserver
The script copying the file to the webroot is the easy part. Your webserver has
to look for the presence of that file and generate a 503 error in order for the
magic to happen. To do that, you have to include an instruction to that effect
in your default server definition and/or your NextCloud virtual server
definition file depending on your setup.
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#### NGINX
You can copy the following code into the relevant server definition(s) on an
NGINX server:
```Perl
server {
...
if (-f /usr/share/nginx/html/503.html) {
return 503;
}
...
error_page 503 @backup
location @backup {
root /usr/share/nginx/html;
rewrite ^(.*)$ /503.html break;
}
}
```
This tells NGINX that if it finds the file *'503.html'* at the path
*'/usr/share/nginx/html'* (webroot) then return an error code 503. When it
encounters an error 503, rewrite any url to *'domain.tld/503.html'* and thus,
display the custom 503 error page. On the other hand, if it can't find 503.html
at the path specified (i.e. the script has deleted it because the backup is
completed), then go about business as usual.
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#### Apache
I don't use apache for anything, ever... so I'm not sure how exactly you'd do
this but I think you'd have to use something like:
```Perl
RewriteEngine On
RewriteCond %{ENV:REDIRECT_STATUS} !=503
RewriteCond "/var/www/503.html" -f
RewriteRule ^ - [R=503,L]
...
ErrorDocument 503 /503.html
...
```
Let me know if that works and I'll update this document accordingly. Like I
said, I don't use Apache so I can't really test it very easily.
#### Disabling 503 functionality altogether
If you don't want to use the 503 functionality for whatever reason and don't
want your log file junked up with warnings about it, then find the section of
the script file that starts with *'--- Begin 503 section ---'* and either
comment all the lines (put a *'#'* at the beginning of each line) or delete all
the lines until you get to *'--- End 503 section ---'*.
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## Scheduling: Cron
After running this script at least once manually to test your settings, you
should schedule it to run automatically so things stay backed up. This is
easiest with a simple cron job.
1. Open root's crontab:
```Bash
sudo crontab -e
```
2. Add your script command line and set the time. I'm assuming your script is
located at *'/root/NCscripts'*, all files are at their default locations and
you want to run your backup at 1:07am daily.
```Bash
7 1 * * * /root/NCscripts/backup.sh -d /var/nc_data -n /usr/share/nginx/html/nextcloud -u www-data -l /var/log/backup.log -w /usr/share/nginx/html > /dev/null 2>&1
```
The last part redirects all output to 'null' and forwards any errors to
'null' also. You don't need output because the script creates a wonderfully
detailed log file that you can review :-)
3. Save the file and exit.
4. Confirm by listing the root user's crontab:
```Bash
sudo crontab -l
```
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## The log file
The script creates a very detailed log file of all major operations along with
any errors and warnings. Everything is timestamped so you can see how long
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things take and when any errors took place. The script includes debugging
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notes such as where temp files are located, where it's looking for data, whether
it created/moved/copied files, etc. All major operations are tagged *'-- [INFO]
message here --'*. Similarily, warnings are tagged *'-- [WARNING] message here
(code: xxxx) --'* and errors are tagged *'-- [ERROR] message here (code: xxx)
--'*. Successful operations generate a *'-- [SUCCESS] message here --'* stamp.
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Sections of the script are all colour-coded to make viewing it easier. This
means you should use something like *'cat backup.log | more'* or *'tail -n
numberOfLines backup.log'* to view the file since the ansi colour codes
would make it difficult to read in nano or vi.
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This tagging makes it easy for you to set up a log screening program to make
keeping an eye on your backup results easier. If you plan on using Logwatch
(highly recommended, great program!) then I've done the work for you...
### Using Logwatch
Log-group, conf and service files are included so that you can easily setup
Logwatch to monitor the script's log file and report at your desired detail
level as follows:
1. 0: Summary of total success, warnings & errors only
2. 1-4: Actual success, error & warning messages
3. 5: Same as above, but includes info messages
4. 6+: Dumps entire raw log file including debugging messages
A detailed breakdown of the files and all options are included in a separate
readme in the *'/etc/logwatch'* folder of this git archive.
If you don't really care how it works, then you can just copy the
*/etc/logwatch* folder to the appropriate Logwatch configuration directory for
your system. The file directory layout in this git archive is already correct
for Debian/Ubuntu systems. You will have to update the log-group file to
reflect the path to your script's log file.
### Remember to rotate your logs
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The log file generated by this script is fairly detailed so it can grow quite
large over time. This is especially true if you are using verbose output from
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borg for any troubleshooting or for compliance/auditing. I've included a sample
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commented logrotate config file in this git archive at *'/etc/logrotate.d'*
which you can modify and drop into that same directory on your Debian/Ubuntu
system. If you are using another log rotating solution, then please remember to
configure it so that your log files don't get overwhelmingly large should you
need to parse them if something goes wrong with your backups.
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## Final notes
I think that's everything. If I've forgotten to document something, please let
me know. I know this readme is long but, I hate how much stuff for linux and
open-source programs/scripts in general are so poorly documented especially for
newbies and I didn't want to make that same mistake.
I don't script too often and I'm a horrible programmer, so if you see anything
that can be/should be improved, please let me know or submit your changes! I
love learning new ways of doing things and getting feedback, so suggestions and
comments are more than welcome.
If this has helped you out, then please visit my blog at
[https://mytechiethoughts.com](https://mytechiethoughts.com) where I solve
problems like this all the time on a shoe-string or zero budget. Thanks!