├── LICENSE ├── README.md ├── ansible └── roles │ ├── ftp_coredump │ ├── Readme.md │ ├── defaults │ │ └── main.yml │ ├── handlers │ │ └── main.yml │ ├── tasks │ │ └── main.yml │ └── templates │ │ ├── core_location.j2 │ │ └── ftp-coredump.sh.j2 │ ├── ftp_server │ ├── Readme.md │ ├── defaults │ │ └── main.yml │ ├── handlers │ │ └── main.yml │ ├── tasks │ │ └── main.yml │ └── templates │ │ └── anonymous_only_vsftpd.conf.j2 │ └── vmcore_ftp │ ├── defaults │ └── main.yml │ ├── files │ └── determine-route.sh │ ├── handlers │ └── main.yml │ ├── readme.md │ ├── tasks │ └── main.yml │ └── templates │ ├── kdump.conf.j2 │ └── pre-crash.sh.j2 └── ftp-coredump.sh.j2 /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | , 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | 2 | 3 | ## Core dumps / vmcores over FTP 4 | 5 | This repo contains two sets of scripts - one for process core dumps over FTP, 6 | and one for system core dumps (crashdumps) over FTP. 7 | 8 | 9 | ### Process core dumps over FTP 10 | 11 | This repo contains a script that lets you dump core over FTP, and the associated ansible roles required to set it up. 12 | 13 | If you aren't using ansible, you could just edit the ftp-coredump.sh.j2 script. To do that, just replace any Jinja2 `{{somevar}}` variables with actual values, and also set the `kernel.core_location` sysctl pattern as shown in `ansible/roles/ftp_coredump/defaults/main.yml`. 14 | 15 | 16 | ### System core dumps over FTP 17 | 18 | The `ansible/roles/vmcore_ftp` directory has a role for configuring the crash 19 | dump over FTP for a particular Linux box. 20 | 21 | Note that the role needs to have some metadata configured - details are in the 22 | `readme.md` file in the role 23 | 24 | 25 | ### License 26 | 27 | This code is licensed under the GNU GPL 2.0 license, a copy of which is included in [LICENSE](LICENSE). 28 | -------------------------------------------------------------------------------- /ansible/roles/ftp_coredump/Readme.md: -------------------------------------------------------------------------------- 1 | 2 | Install the ftp coredump script, and set up sysctl. 3 | -------------------------------------------------------------------------------- /ansible/roles/ftp_coredump/defaults/main.yml: -------------------------------------------------------------------------------- 1 | 2 | # Core pattern 3 | sysctls_kernel_core_pattern: "|/usr/local/bin/ftp-coredump.sh core.%e.%h.%p.%t" 4 | 5 | # Change these settings 6 | core_ftp_server: "ftp.myorg.com" 7 | core_ftp_user: "ftp" 8 | core_ftp_pass: "ftp" 9 | 10 | # Path to drop the files in, relative to the login directory of the ftp user 11 | core_ftp_remote_dir: "cores" 12 | 13 | # Seconds before ncftp will time out 14 | core_ftp_upload_timeout: "15" 15 | -------------------------------------------------------------------------------- /ansible/roles/ftp_coredump/handlers/main.yml: -------------------------------------------------------------------------------- 1 | - name: sysctl update 2 | service: 3 | name: "systemd-sysctl.service" 4 | state: restarted 5 | 6 | -------------------------------------------------------------------------------- /ansible/roles/ftp_coredump/tasks/main.yml: -------------------------------------------------------------------------------- 1 | 2 | - name: Add sysctl template 3 | template: 4 | src: "core_location.j2" 5 | dest: "/etc/sysctl.d/core_location.conf" 6 | owner: root 7 | group: root 8 | mode: 0644 9 | notify: 10 | - sysctl update 11 | 12 | - name: Distribute ftp core dump script 13 | template: 14 | src: "ftp-coredump.sh.j2" 15 | dest: "/usr/local/bin/ftp-coredump.sh" 16 | mode: 0755 17 | 18 | - name: Add ncftp for the ftp core dump script 19 | yum: 20 | name: "ncftp" 21 | state: latest 22 | -------------------------------------------------------------------------------- /ansible/roles/ftp_coredump/templates/core_location.j2: -------------------------------------------------------------------------------- 1 | 2 | # Where core dumps go 3 | kernel.core_pattern = {{ sysctls_kernel_core_pattern }} 4 | kernel.core_uses_pid = 1 5 | 6 | -------------------------------------------------------------------------------- /ansible/roles/ftp_coredump/templates/ftp-coredump.sh.j2: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | # 3 | # Reads a core file from stdin and sends it to an FTP server. 4 | # 5 | # The name of the core file is passed as a command line parameter 6 | # to the script. Typically, the core_pattern will use a set of 7 | # substitution parameters to build up a file name. A subset of 8 | # valid core_pattern substitutions are displayed below: 9 | # 10 | # Executable name (%e) 11 | # Host name (or container name) (%h) 12 | # Pid in its namespace (%p) 13 | # Pid in global NS (%P) 14 | # Timestamp (seconds) (%t) 15 | # 16 | # 17 | # In short, to get this to work, do the following: 18 | # 19 | # Client side: 20 | # 21 | # Set the core pattern to something like: 22 | # "|/usr/local/bin/ftp-coredump.sh core.%e.%h.%p.%P.%t" 23 | # 24 | # 25 | # Server side: 26 | # 27 | # Configure an FTP server that supports anonymous uploads to 28 | # some directory. The anon user also needs to have permissions 29 | # to create directories, so that the core files can be separated 30 | # by directory. E.g. vsftpd supports these requirements. 31 | # 32 | # 33 | # The filename on the remote server will be generated as: 34 | # /real_hostname/ 35 | # 36 | # 37 | # A note on compression: 38 | # 39 | # I tested both gzip, bzip2 and xz compression, and as we have such fast storage 40 | # it makes the whole process slower. The first and foremost goal must be to get 41 | # the core dump process completed as soon as possible, so therefore I have removed 42 | # the compression bits. 43 | # 44 | # Example: Test core file of 8063352832 bytes. Reading from one openstack 45 | # machine, with the file in cache, and writing to the FTP server. 46 | # 47 | # Method | Time 48 | # ==================+========================== 49 | # no compression | 20s 50 | # bzip2 | many minutes - cancelled 51 | # gzip | 3m39s 52 | # gzip -1 | 1m45 53 | # xz -1 | 5m37 54 | # 55 | 56 | # filename parameter 57 | short_fn=$1 58 | 59 | # Immediately clone stdin to fd 100 and close stdin to avoid anyone else eating input 60 | exec 100<&0 61 | exec 0<&- 62 | 63 | # Note, these parameters are ansible-managed. 64 | # See roles/sysctls/base/templates/ftp-coredump.sh.j2 65 | remote_host={{ core_ftp_server }} 66 | ftp_user={{ core_ftp_user|default("ftp") }} 67 | passwd={{ core_ftp_pass|default("ftp") }} 68 | remote_basepath={{ core_ftp_remote_dir|default("cores") }} 69 | ftp_timeout={{ core_ftp_upload_timeout|default("15") }} 70 | real_hostname=$(hostname) 71 | 72 | if [[ -n "$remote_basepath" ]]; then 73 | filename="$remote_basepath/$real_hostname/$short_fn" 74 | else 75 | filename="$real_hostname/$short_fn" 76 | fi 77 | 78 | 79 | # Send the file 80 | start_time=$(date +%s) 81 | ncftpput -t "$ftp_timeout" -m -c "$remote_host" "$filename" < /proc/self/fd/100 82 | ftp_rv=$? 83 | end_time=$(date +%s) 84 | delta_time=$(echo $end_time - $start_time | bc) 85 | 86 | # ... and also log to local syslog 87 | if [[ $ftp_rv -ne 0 ]]; then 88 | logger "Core dump: error: Attempted to dump $filename to ftp://$remote_host, but failed. Spent $delta_time seconds." 89 | else 90 | logger "Core dump: success: Sent $real_hostname/$short_fn to ftp://$remote_host. Spent $delta_time seconds." 91 | fi 92 | -------------------------------------------------------------------------------- /ansible/roles/ftp_server/Readme.md: -------------------------------------------------------------------------------- 1 | 2 | Install vsftpd, and configure for anonymous access for the core dump script. 3 | 4 | -------------------------------------------------------------------------------- /ansible/roles/ftp_server/defaults/main.yml: -------------------------------------------------------------------------------- 1 | --- 2 | 3 | # This is the base directory of the ftp server (i.e. where files are uploaded) 4 | ftp_server_base: /scratch/crash/ftp 5 | -------------------------------------------------------------------------------- /ansible/roles/ftp_server/handlers/main.yml: -------------------------------------------------------------------------------- 1 | --- 2 | 3 | - name: Restarting vsftpd 4 | service: 5 | name: vsftpd 6 | state: restarted 7 | -------------------------------------------------------------------------------- /ansible/roles/ftp_server/tasks/main.yml: -------------------------------------------------------------------------------- 1 | --- 2 | 3 | - name: Installing vsftpd 4 | yum: 5 | name: vsftpd 6 | state: present 7 | 8 | - name: Deploying configuration file 9 | template: 10 | src: templates/anonymous_only_vsftpd.conf.j2 11 | dest: /etc/vsftpd/vsftpd.conf 12 | owner: root 13 | group: root 14 | mode: 0600 15 | notify: 16 | - Restarting vsftpd 17 | 18 | - name: Enabling and starting vsftpd service 19 | service: 20 | name: vsftpd 21 | enabled: yes 22 | state: started 23 | -------------------------------------------------------------------------------- /ansible/roles/ftp_server/templates/anonymous_only_vsftpd.conf.j2: -------------------------------------------------------------------------------- 1 | # Note: anon_root folder cannot be writable by ftp user, otherwise you will get: 2 | # 500 OOPS: vsftpd: refusing to run with writable root inside chroot() 3 | 4 | anon_mkdir_write_enable=YES 5 | anon_root={{ ftp_server_base }} 6 | anon_umask=022 7 | anon_upload_enable=YES 8 | chown_upload_mode=0664 9 | connect_from_port_20=YES 10 | dirmessage_enable=YES 11 | ftpd_banner=Welcome to the core dump server 12 | hide_ids=YES 13 | listen_ipv6=NO 14 | listen=YES 15 | no_anon_password=YES 16 | pam_service_name=vsftpd 17 | tcp_wrappers=YES 18 | userlist_enable=YES 19 | write_enable=YES 20 | xferlog_enable=YES 21 | xferlog_std_format=YES 22 | -------------------------------------------------------------------------------- /ansible/roles/vmcore_ftp/defaults/main.yml: -------------------------------------------------------------------------------- 1 | # FTP server to send crash dumps to 2 | crashdump_ftp_server: "my_anon_ftp_server" 3 | 4 | default_dns_servers: "my_internal_ip_1 my_internal_ip_2" 5 | -------------------------------------------------------------------------------- /ansible/roles/vmcore_ftp/files/determine-route.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | # 3 | # Figure out what interface/ip currently holds the default gw 4 | 5 | route_dev=$(ip route | awk '/default via/ { print $NF } ') 6 | route_gw=$(ip route | awk '/default via/ { print $3 } ') 7 | my_ip=$(ip addr show dev $route_dev | grep -w $route_dev | grep inet | awk ' { print $2 } ') 8 | 9 | # If we have a bonded interface, get the name of the currently active slave 10 | echo $route_dev | grep -q bond 11 | if [[ $? -eq 0 ]]; then 12 | # This is bondness 13 | route_dev=$(cat /proc/net/bonding/$route_dev | awk '/Currently Active Slave:/ { print $NF } ') 14 | fi 15 | 16 | if [[ -n "$route_dev" && -n "$route_gw" ]]; then 17 | echo "$route_dev" 18 | echo "$route_gw" 19 | echo "$my_ip" 20 | exit 0 21 | else 22 | echo "Could not determine default route interface or gateway" 23 | exit 1 24 | fi 25 | -------------------------------------------------------------------------------- /ansible/roles/vmcore_ftp/handlers/main.yml: -------------------------------------------------------------------------------- 1 | - name: restart kdump 2 | service: 3 | name: kdump 4 | state: restarted 5 | -------------------------------------------------------------------------------- /ansible/roles/vmcore_ftp/readme.md: -------------------------------------------------------------------------------- 1 | Description 2 | --- 3 | 4 | This role configures FTP based system crash dumps. 5 | 6 | Kdump doesn't natively support ftp based kdumps, but we use a kdump_pre script, which: 7 | - brings up networking 8 | - makedumpfile's the core 9 | - sends it (inline) to the configured FTP server. 10 | 11 | When bringing up networking, the script will first try using DHCP, but if that doesn't work, it will revert to the static IP the box had when ansible was last run against it. 12 | 13 | 14 | Configuration 15 | --- 16 | 17 | These variables should be set for the hosts (or changed in defaults/main.yml) 18 | 19 | ``` 20 | crashdump_ftp_server Set to an FTP server that allows upload by the user ftp. 21 | default_dns_servers Space separated list of DNS servers for your environment 22 | crashdump_ftp_basepath The directory to upload to on the FTP server. Defaults 23 | to 'crashdump' 24 | ``` 25 | -------------------------------------------------------------------------------- /ansible/roles/vmcore_ftp/tasks/main.yml: -------------------------------------------------------------------------------- 1 | - name: Distribute route determining script 2 | copy: 3 | src: determine-route.sh 4 | dest: /usr/local/sbin 5 | mode: 0755 6 | notify: restart kdump 7 | 8 | - name: Run route determining script 9 | command: /usr/local/sbin/determine-route.sh 10 | register: kdump_route_info 11 | changed_when: false 12 | check_mode: no 13 | 14 | - name: set crashdump interface facts 15 | set_fact: 16 | crashdump_ftp_use_interface: "{{ kdump_route_info.stdout_lines[0] }}" 17 | crashdump_ftp_use_route: "{{ kdump_route_info.stdout_lines[1] }}" 18 | crashdump_ftp_fallback_ip: "{{ kdump_route_info.stdout_lines[2] }}" 19 | 20 | - name: Set up /etc/kdump.conf 21 | template: 22 | src: kdump.conf.j2 23 | dest: /etc/kdump.conf 24 | mode: 0644 25 | notify: restart kdump 26 | 27 | - name: Distribute pre-crash.sh script 28 | template: 29 | src: pre-crash.sh.j2 30 | dest: /usr/local/sbin/pre-crash.sh 31 | mode: 0755 32 | register: pre_crash_reg 33 | notify: restart kdump 34 | 35 | # if the pre-crash.sh script got updated, but not kdump.conf, a restart 36 | # of kdump on its own (by the notifier) will not rebuild the initramfs, 37 | # so we touch /etc/kdump.conf to force a rebuild 38 | - name: Touch /etc/kdump.conf if pre-crash.sh changed 39 | file: 40 | path: /etc/kdump.conf 41 | state: touch 42 | when: pre_crash_reg.changed 43 | 44 | - name: Install ncftpput for the crash script 45 | yum: 46 | name: "ncftp" 47 | state: latest 48 | -------------------------------------------------------------------------------- /ansible/roles/vmcore_ftp/templates/kdump.conf.j2: -------------------------------------------------------------------------------- 1 | 2 | # This kdump config runs the pre-crash script (which sends a file with FTP), and then reboots. 3 | # 4 | # Note, the next comment line is useful as it makes kdump rebuild the initramfs if 5 | # a machine moves to a different VLAN, or different interface name: 6 | # 7 | # Set up to use {{ ansible_default_ipv4['interface'] }} (route {{ ansible_default_ipv4['gateway'] }}) 8 | # 9 | extra_bins /usr/bin/ncftpput /usr/local/sbin/pre-crash.sh /usr/bin/uniq /usr/bin/sort /bin/sha1sum /bin/tee 10 | kdump_pre /usr/local/sbin/pre-crash.sh 11 | core_collector cat 12 | -------------------------------------------------------------------------------- /ansible/roles/vmcore_ftp/templates/pre-crash.sh.j2: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | # Note, these parameters are ansible-managed 4 | remote_host="{{ crashdump_ftp_server }}" 5 | ftp_user=ftp 6 | passwd=ftp 7 | remote_basepath="{{ crashdump_ftp_basepath|default('crashdump') }}" 8 | ftp_timeout="{{ crashdump_ftp_timeout|default('15') }}" 9 | 10 | # The ip_interface needs to be one that can DHCP, and route to the ftp server 11 | ip_interface="{{ crashdump_ftp_use_interface }}" 12 | ip_default_gw="{{ crashdump_ftp_use_route }}" 13 | 14 | # Use this in case dhcp fails (our current IP as determined when ansible ran) 15 | backup_ip="{{crashdump_ftp_fallback_ip}}" 16 | 17 | real_hostname="{{ ansible_nodename }}" 18 | short_fn=vmcore.$(date +%Y-%m-%d-%H-%M-%S) 19 | 20 | 21 | # Do DHCP, and set up resolv conf + default route (because it is broken in the initramfs) 22 | do_dhcp() 23 | { 24 | echo "Running dhclient to get an IP" 25 | mkdir -p /var/lib/dhclient 26 | /sbin/dhclient -lf /var/lib/dhclient/dhclient.lease $ip_interface 27 | 28 | if [[ $? -ne 0 ]]; then 29 | echo 30 | echo "Failed to determine IP address - falling back to using static IP $backup_ip!" 31 | 32 | ip link set $ip_interface up 33 | ip addr add $backup_ip dev $ip_interface 34 | fi 35 | 36 | # Populate /etc/resolv.conf, because that is broken in the initramfs... 37 | echo 38 | echo "Populating /etc/resolv.conf" 39 | dhcp_lease=/var/lib/dhclient/dhclient.lease 40 | nameservers="" 41 | if [[ -f "$dhcp_lease" ]]; then 42 | nameservers=`grep domain-name-servers $dhcp_lease | awk ' { print $NF } ' | tr '[,;]' ' '` 43 | fi 44 | if [[ -z "$nameservers" ]]; then 45 | nameservers="{{ default_dns_servers }}" 46 | fi 47 | for i in $nameservers; do 48 | echo "nameserver $i" 49 | done | sort | uniq > /etc/resolv.conf 50 | 51 | # Set up default route, because that is broken in the initramfs... 52 | echo "Determined default route to be: $ip_default_gw" 53 | ip route add default via $ip_default_gw dev $ip_interface 54 | echo 55 | echo "Route table:" 56 | echo 57 | ip route 58 | 59 | echo 60 | echo "Contents of /etc/resolv.conf" 61 | ls -la /etc/resolv.conf 62 | cat /etc/resolv.conf 63 | } 64 | 65 | 66 | dump_and_transfer() 67 | { 68 | local remote_filename=$1 69 | local level=$2 70 | 71 | if [[ -p vmcore-fifo ]]; then 72 | # remove vmcore-fifo if it exists 73 | rm -f vmcore-fifo 74 | fi 75 | 76 | echo "Uploading coredump with -d $level file" 77 | mkfifo vmcore-fifo 78 | makedumpfile -F -l -d $level /proc/vmcore | tee vmcore-fifo | sha1sum > vmcore.sha1sum & 79 | cat vmcore-fifo | /usr/bin/ncftpput -t "$ftp_timeout" -m -c "$remote_host" "$remote_filename" 80 | local rv=$? 81 | 82 | # Also upload the checksum 83 | echo "Uploading checksum file" 84 | cat vmcore.sha1sum | /usr/bin/ncftpput -t "$ftp_timeout" -m -c "$remote_host" "${remote_filename}.sha1sum" 85 | # don't care about return value here... 86 | 87 | return $rv 88 | } 89 | 90 | 91 | do_ftp() 92 | { 93 | echo "Dumping small (-d 31) vmcore to FTP site" 94 | if [[ -n "$remote_basepath" ]]; then 95 | filename="$remote_basepath/$real_hostname/$short_fn" 96 | else 97 | filename="$real_hostname/$short_fn" 98 | fi 99 | 100 | # Create fifo to dump to, so that we can generate a checksum, and also upload to FTP 101 | start_time=$(date +%s) 102 | dump_and_transfer "$filename" 31 103 | # If things went wrong, we still keep going anyway... 104 | end_time=$(date +%s) 105 | delta_time=$(($end_time - $start_time)) 106 | 107 | # build a status file and send that too... 108 | echo "Uploading info file" 109 | ( 110 | echo 111 | echo "Start time: $(date -d @$start_time)" 112 | echo "End time: $(date -d @$end_time)" 113 | echo "Seconds spent: $delta_time" 114 | echo 115 | echo "Network info:" 116 | echo "IP" 117 | ip a 118 | echo 119 | echo "Routes" 120 | ip route 121 | echo 122 | echo "Lease info" 123 | ls -l /var/lib/dhclient/dhclient.lease 124 | cat /var/lib/dhclient/dhclient.lease 125 | ) | /usr/bin/ncftpput -t "$ftp_timeout" -m -c "$remote_host" "${filename}.info" 126 | 127 | 128 | # Now, additionally, upload the big dump (with user pages) 129 | echo 130 | echo "Uploading the coredump with user + cache pages as well." 131 | echo "If you don't want to wait you can reboot now" 132 | echo 133 | dump_and_transfer "${filename}.full" 17 134 | } 135 | 136 | 137 | echo 138 | echo "Starting pre-script" 139 | echo 140 | 141 | do_dhcp 142 | do_ftp 143 | 144 | # Sleep so we have time to see any error messages if we're debugging... 145 | sleep 10 146 | 147 | echo 148 | echo "Rebooting machine..." 149 | reboot -f 150 | 151 | -------------------------------------------------------------------------------- /ftp-coredump.sh.j2: -------------------------------------------------------------------------------- 1 | ansible/roles/ftp_coredump/templates/ftp-coredump.sh.j2 --------------------------------------------------------------------------------