add doc page for fs_errors

docs/20_Checks/_index.md

@@ -20,6 +20,8 @@ There is one include script used by all checks:
 * [check_disk-io](check_disk-io.md)
 * [check_dns_responsetime](check_dns_responsetime.md)
 * [check_eol](check_eol.md)
+* [check_fs_errors](check_fs_errors.md)
+* check_fs_writable
 * check_haproxy_health
 * check_haproxy_status
 * check_memory

docs/20_Checks/check_fs_errors.md

+# Check filesystem errors
+
+## Introduction
+
+**check_fs_errors** checks if kernel logs inconsistency messages in the journallog.
+It requires sudo permission on /bin/journalctl
+
+If it would find error messages it switches to critical and shows the found journallog entries.
+
+## Requirements
+
+* sudo permission on /bin/journalctl to scan for the information
+
+```txt
+icingaclient ALL=(ALL) NOPASSWD: /bin/journalctl
+```
+
+## Syntax
+
+```txt
+______________________________________________________________________
+
+CHECK_FS_ERRORS 
+v1.2
+
+(c) Institute for Medical Education - University of Bern
+Licence: GNU GPL 3
+______________________________________________________________________
+
+Check if kernel logs inconsistency messages in the journallog.
+It requires sudo permission on /bin/journalctl
+
+SYNTAX:
+check_fs_errors [-h]
+
+OPTIONS:
+
+    -h or --help   show this help.
+
+PARAMETERS:
+
+    none
+
+EXAMPLE:
+check_fs_errors
+```
+
+### Parameters
+
+(none)
+
+## Examples
+
+`$ check_fs_errors` returns
+
+```txt
+OK: check if kernel logs inconsistency messages
+```