Copyright (c) 2014-2021 The Monero Project.
Portions Copyright (c) 2012-2013 The Cryptonote developers.
Table of Contents
- Development resources
- Vulnerability response
- About this project
- Supporting the project
- Scheduled software upgrades
- Release staging schedule and protocol
- Compiling Monero from source
- Using Tor
- Known issues
- Web: getmonero.org
- Forum: forum.getmonero.org
- Mail: email@example.com
- GitHub: https://github.com/monero-project/monero
- IRC: #monero-dev on Libera
- It is HIGHLY recommended that you join the #monero-dev IRC channel if you are developing software that uses Monero. Due to the nature of this open source software project, joining this channel and idling is the best way to stay updated on best practices and new developments in the Monero ecosystem. All you need to do is join the IRC channel and idle to stay updated with the latest in Monero development. If you do not, you risk wasting resources on developing integrations that are not compatible with the Monero network. The Monero core team and community continuously make efforts to communicate updates, developments, and documentation via other platforms – but for the best information, you need to talk to other Monero developers, and they are on IRC. #monero-dev is about Monero development, not getting help about using Monero, or help about development of other software, including yours, unless it also pertains to Monero code itself. For these cases, checkout #monero.
- Our Vulnerability Response Process encourages responsible disclosure
- We are also available via HackerOne
The Monero Research Lab is an open forum where the community coordinates research into Monero cryptography, protocols, fungibility, analysis, and more. We welcome collaboration and contributions from outside researchers! Because not all Lab work and publications are distributed as traditional preprints or articles, they may be easy to miss if you are conducting literature reviews for your own Monero research. You are encouraged to get in touch with the Monero research community if you have questions, wish to collaborate, or would like guidance to help avoid unnecessarily duplicating earlier or known work.
The Monero research community is available on IRC in #monero-research-lab on Libera, which is also accessible via Matrix.
- You can subscribe to an announcement listserv to get critical announcements from the Monero core team. The announcement list can be very helpful for knowing when software updates are needed.
The CLI wallet is available in different languages. If you want to help translate it, see our self-hosted localization platform, Weblate, on translate.getmonero.org. Every translation must be uploaded on the platform, pull requests directly editing the code in this repository will be closed. If you need help with Weblate, you can find a guide with screenshots here.
If you need help/support/info about translations, contact the localization workgroup. You can find the complete list of contacts on the repository of the workgroup: monero-translations.
Monero is a private, secure, untraceable, decentralised digital currency. You are your bank, you control your funds, and nobody can trace your transfers unless you allow them to do so.
Privacy: Monero uses a cryptographically sound system to allow you to send and receive funds without your transactions being easily revealed on the blockchain (the ledger of transactions that everyone has). This ensures that your purchases, receipts, and all transfers remain private by default.
Security: Using the power of a distributed peer-to-peer consensus network, every transaction on the network is cryptographically secured. Individual wallets have a 25-word mnemonic seed that is only displayed once and can be written down to backup the wallet. Wallet files should be encrypted with a strong passphrase to ensure they are useless if ever stolen.
Untraceability: By taking advantage of ring signatures, a special property of a certain type of cryptography, Monero is able to ensure that transactions are not only untraceable but have an optional measure of ambiguity that ensures that transactions cannot easily be tied back to an individual user or computer.
Decentralization: The utility of Monero depends on its decentralised peer-to-peer consensus network - anyone should be able to run the monero software, validate the integrity of the blockchain, and participate in all aspects of the monero network using consumer-grade commodity hardware. Decentralization of the monero network is maintained by software development that minimizes the costs of running the monero software and inhibits the proliferation of specialized, non-commodity hardware.
About this project
This is the core implementation of Monero. It is open source and completely free to use without restrictions, except for those specified in the license agreement below. There are no restrictions on anyone creating an alternative implementation of Monero that uses the protocol and network in a compatible manner.
As with many development projects, the repository on Github is considered to be the "staging" area for the latest changes. Before changes are merged into that branch on the main repository, they are tested by individual developers in their own branches, submitted as a pull request, and then subsequently tested by contributors who focus on testing and code reviews. That having been said, the repository should be carefully considered before using it in a production environment, unless there is a patch in the repository for a particular show-stopping issue you are experiencing. It is generally a better idea to use a tagged release for stability.
Anyone is welcome to contribute to Monero's codebase! If you have a fix or code change, feel free to submit it as a pull request directly to the "master" branch. In cases where the change is relatively small or does not affect other parts of the codebase, it may be merged in immediately by any one of the collaborators. On the other hand, if the change is particularly large or complex, it is expected that it will be discussed at length either well in advance of the pull request being submitted, or even directly on the pull request.
Supporting the project
Monero is a 100% community-sponsored endeavor. If you want to join our efforts, the easiest thing you can do is support the project financially. Both Monero and Bitcoin donations can be made to donate.getmonero.org if using a client that supports the OpenAlias standard. Alternatively, you can send XMR to the Monero donation address via the
donate command (type
help in the command-line wallet for details).
The Monero donation address is:
f359631075708155cc3d92a32b75a7d02a5dcf27756707b47a2b31b21c389501; base address for restoring with address and viewkey:
The Bitcoin donation address is:
Core development funding and/or some supporting services are also graciously provided by sponsors:
There are also several mining pools that kindly donate a portion of their fees, a list of them can be found on our Bitcointalk post.
If you want to help out, see CONTRIBUTING for a set of guidelines.
Scheduled software upgrades
Monero uses a fixed-schedule software upgrade (hard fork) mechanism to implement new features. This means that users of Monero (end users and service providers) should run current versions and upgrade their software on a regular schedule. Software upgrades occur during the months of April and October. The required software for these upgrades will be available prior to the scheduled date. Please check the repository prior to this date for the proper Monero software version. Below is the historical schedule and the projected schedule for the next upgrade. Dates are provided in the format YYYY-MM-DD.
|Software upgrade block height||Date||Fork version||Minimum Monero version||Recommended Monero version||Details|
|1009827||2016-03-22||v2||v0.9.4||v0.9.4||Allow only >= ringsize 3, blocktime = 120 seconds, fee-free blocksize 60 kb|
|1141317||2016-09-21||v3||v0.9.4||v0.10.0||Splits coinbase into denominations|
|1220516||2017-01-05||v4||v0.10.1||v0.10.2.1||Allow normal and RingCT transactions|
|1288616||2017-04-15||v5||v0.10.3.0||v0.10.3.1||Adjusted minimum blocksize and fee algorithm|
|1400000||2017-09-16||v6||v0.11.0.0||v0.11.0.0||Allow only RingCT transactions, allow only >= ringsize 5|
|1546000||2018-04-06||v7||v0.12.0.0||v0.12.3.0||Cryptonight variant 1, ringsize >= 7, sorted inputs|
|1685555||2018-10-18||v8||v0.13.0.0||v0.13.0.4||max transaction size at half the penalty free block size, bulletproofs enabled, cryptonight variant 2, fixed ringsize 11|
|1788000||2019-03-09||v10||v0.14.0.0||v0.14.1.2||New PoW based on Cryptonight-R, new block weight algorithm, slightly more efficient RingCT format|
|1788720||2019-03-10||v11||v0.14.0.0||v0.14.1.2||forbid old RingCT transaction format|
|1978433||2019-11-30||v12||v0.15.0.0||v0.16.0.0||New PoW based on RandomX, only allow >= 2 outputs, change to the block median used to calculate penalty, v1 coinbases are forbidden, rct sigs in coinbase forbidden, 10 block lock time for incoming outputs|
|2210000||2020-10-17||v13||v0.17.0.0||v0.17.1.1||New CLSAG transaction format|
|2210720||2020-10-18||v14||v0.17.1.1||v0.17.1.7||forbid old MLSAG transaction format|
X's indicate that these details have not been determined as of commit date.
* indicates estimate as of commit date
Release staging schedule and protocol
Approximately three months prior to a scheduled software upgrade, a branch from master will be created with the new release version tag. Pull requests that address bugs should then be made to both master and the new release branch. Pull requests that require extensive review and testing (generally, optimizations and new features) should not be made to the release branch.
Compiling Monero from source
The following table summarizes the tools and libraries required to build. A
few of the libraries are also included in this repository (marked as
"Vendored"). By default, the build uses the library installed on the system
and ignores the vendored sources. However, if no library is found installed on
the system, then the vendored source will be built and used. The vendored
sources are also used for statically-linked builds because distribution
packages often include only shared library binaries (
.so) but not static
library archives (
|Dep||Min. version||Vendored||Debian/Ubuntu pkg||Arch pkg||Void pkg||Fedora pkg||Optional||Purpose|
 On Debian/Ubuntu
libgtest-dev only includes sources and headers. You must
build the library binary manually. This can be done with the following command
sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo cmake . && sudo make
- on Debian:
sudo mv libg* /usr/lib/
- on Ubuntu:
sudo mv lib/libg* /usr/lib/
 libnorm-dev is needed if your zmq library was built with libnorm, and not needed otherwise
Install all dependencies at once on Debian/Ubuntu:
sudo apt update && sudo apt install build-essential cmake pkg-config libssl-dev libzmq3-dev libunbound-dev libsodium-dev libunwind8-dev liblzma-dev libreadline6-dev libldns-dev libexpat1-dev libpgm-dev qttools5-dev-tools libhidapi-dev libusb-1.0-0-dev libprotobuf-dev protobuf-compiler libudev-dev libboost-chrono-dev libboost-date-time-dev libboost-filesystem-dev libboost-locale-dev libboost-program-options-dev libboost-regex-dev libboost-serialization-dev libboost-system-dev libboost-thread-dev ccache doxygen graphviz
Install all dependencies at once on openSUSE:
sudo zypper ref && sudo zypper in cppzmq-devel ldns-devel libboost_chrono-devel libboost_date_time-devel libboost_filesystem-devel libboost_locale-devel libboost_program_options-devel libboost_regex-devel libboost_serialization-devel libboost_system-devel libboost_thread-devel libexpat-devel libminiupnpc-devel libsodium-devel libunwind-devel unbound-devel cmake doxygen ccache fdupes gcc-c++ libevent-devel libopenssl-devel pkgconf-pkg-config readline-devel xz-devel libqt5-qttools-devel patterns-devel-C-C++-devel_C_C++
Install all dependencies at once on macOS with the provided Brewfile:
brew update && brew bundle --file=contrib/brew/Brewfile
FreeBSD 12.1 one-liner required to build dependencies:
pkg install git gmake cmake pkgconf boost-libs libzmq4 libsodium unbound
Cloning the repository
Clone recursively to pull-in needed submodule(s):
$ git clone --recursive https://github.com/monero-project/monero
If you already have a repo cloned, initialize and update:
$ cd monero && git submodule init && git submodule update
Note: If there are submodule differences between branches, you may need
git submodule sync && git submodule update after changing branches
to build successfully.
Monero uses the CMake build system and a top-level Makefile that invokes cmake commands as needed.
On Linux and macOS
Install the dependencies
Change to the root of the source code directory, change to the most recent release branch, and build:
cd monero git checkout release-v0.17 make
Optional: If your machine has several cores and enough memory, enable parallel build by running
make -j<number of threads>instead of
make. For this to be worthwhile, the machine should have one core and about 2GB of RAM available per thread.
Note: The instructions above will compile the most stable release of the Monero software. If you would like to use and test the most recent software, use
git checkout master. The master branch may contain updates that are both unstable and incompatible with release software, though testing is always encouraged.
The resulting executables can be found in
Run Monero with
Optional: build and run the test suite to verify the binaries:
core_teststest may take a few hours to complete.
Optional: to build binaries suitable for debugging:
Optional: to build statically-linked binaries:
Dependencies need to be built with -fPIC. Static libraries usually aren't, so you may have to build them yourself with -fPIC. Refer to their documentation for how to build them.
Optional: build documentation in
graphvizis not installed):
HAVE_DOT=YES doxygen Doxyfile
Optional: use ccache not to rebuild translation units, that haven't really changed. Monero's CMakeLists.txt file automatically handles it
sudo apt install ccache
On the Raspberry Pi
Tested on a Raspberry Pi Zero with a clean install of minimal Raspbian Stretch (2017-09-07 or later) from https://www.raspberrypi.org/downloads/raspbian/. If you are using Raspian Jessie, please see note in the following section.
apt-get update && apt-get upgradeto install all of the latest software
Install the dependencies for Monero from the 'Debian' column in the table above.
Increase the system swap size:
sudo /etc/init.d/dphys-swapfile stop sudo nano /etc/dphys-swapfile CONF_SWAPSIZE=2048 sudo /etc/init.d/dphys-swapfile start
If using an external hard disk without an external power supply, ensure it gets enough power to avoid hardware issues when syncing, by adding the line "max_usb_current=1" to /boot/config.txt
Clone Monero and checkout the most recent release version:
git clone https://github.com/monero-project/monero.git cd monero git checkout tags/v0.17.1.0
USE_SINGLE_BUILDDIR=1 make release
Wait 4-6 hours
The resulting executables can be found in
Run Monero with
You may wish to reduce the size of the swap file after the build has finished, and delete the boost directory from your home directory
Note for Raspbian Jessie users:
If you are using the older Raspbian Jessie image, compiling Monero is a bit more complicated. The version of Boost available in the Debian Jessie repositories is too old to use with Monero, and thus you must compile a newer version yourself. The following explains the extra steps and has been tested on a Raspberry Pi 2 with a clean install of minimal Raspbian Jessie.
apt-get update && apt-get upgradeto install all of the latest software, and increase the system swap size
sudo /etc/init.d/dphys-swapfile stop sudo nano /etc/dphys-swapfile CONF_SWAPSIZE=2048 sudo /etc/init.d/dphys-swapfile start
Then, install the dependencies for Monero except for
Install the latest version of boost (this may first require invoking
apt-get remove --purge libboost*-devto remove a previous version if you're not using a clean install):
cd wget https://sourceforge.net/projects/boost/files/boost/1.72.0/boost_1_72_0.tar.bz2 tar xvfo boost_1_72_0.tar.bz2 cd boost_1_72_0 ./bootstrap.sh sudo ./b2
Wait ~8 hours
sudo ./bjam cxxflags=-fPIC cflags=-fPIC -a install
Wait ~4 hours
From here, follow the general Raspberry Pi instructions from the "Clone Monero and checkout most recent release version" step.
Binaries for Windows are built on Windows using the MinGW toolchain within MSYS2 environment. The MSYS2 environment emulates a POSIX system. The toolchain runs within the environment and cross-compiles binaries that can run outside of the environment as a regular Windows application.
Preparing the build environment
Download and install the MSYS2 installer, either the 64-bit or the 32-bit package, depending on your system.
Open the MSYS shell via the
Update packages using pacman:
Exit the MSYS shell using Alt+F4
Edit the properties for the
MSYS2 Shellshortcut changing "msys2_shell.bat" to "msys2_shell.cmd -mingw64" for 64-bit builds or "msys2_shell.cmd -mingw32" for 32-bit builds
Restart MSYS shell via modified shortcut and update packages again using pacman:
To build for 64-bit Windows:
pacman -S mingw-w64-x86_64-toolchain make mingw-w64-x86_64-cmake mingw-w64-x86_64-boost mingw-w64-x86_64-openssl mingw-w64-x86_64-zeromq mingw-w64-x86_64-libsodium mingw-w64-x86_64-hidapi mingw-w64-x86_64-unbound
To build for 32-bit Windows:
pacman -S mingw-w64-i686-toolchain make mingw-w64-i686-cmake mingw-w64-i686-boost mingw-w64-i686-openssl mingw-w64-i686-zeromq mingw-w64-i686-libsodium mingw-w64-i686-hidapi mingw-w64-i686-unbound
Open the MingW shell via
MinGW-w64-Win64 Shellshortcut on 64-bit Windows or
MinGW-w64-Win64 Shellshortcut on 32-bit Windows. Note that if you are running 64-bit Windows, you will have both 64-bit and 32-bit MinGW shells.
To git clone, run:
git clone --recursive https://github.com/monero-project/monero.git
Change to the cloned directory, run:
If you would like a specific version/tag, do a git checkout for that version. eg. 'v0.17.1.0'. If you don't care about the version and just want binaries from master, skip this step:
git checkout v0.17.1.0
If you are on a 64-bit system, run:
If you are on a 32-bit system, run:
The resulting executables can be found in
Optional: to build Windows binaries suitable for debugging on a 64-bit system, run:
Optional: to build Windows binaries suitable for debugging on a 32-bit system, run:
The resulting executables can be found in
The project can be built from scratch by following instructions for Linux above(but use
gmake instead of
If you are running Monero in a jail, you need to add
sysvsem="new" to your jail configuration, otherwise lmdb will throw the error message:
Failed to open lmdb environment: Function not implemented.
Monero is also available as a port or package as 'monero-cli`.
You will need to add a few packages to your system.
pkg_add cmake gmake zeromq libiconv boost.
graphviz packages are optional and require the xbase set.
Running the test suite also requires
env DEVELOPER_LOCAL_TOOLS=1 BOOST_ROOT=/usr/local gmake release-static
Note: you may encounter the following error when compiling the latest version of Monero as a normal user:
LLVM ERROR: out of memory c++: error: unable to execute command: Abort trap (core dumped)
Then you need to increase the data ulimit size to 2GB and try again:
ulimit -d 2000000
Check that the dependencies are present:
pkg_info -c libexecinfo boost-headers boost-libs protobuf readline libusb1 zeromq git-base pkgconf gmake cmake | more, and install any that are reported missing, using
pkg_add or from your pkgsrc tree. Readline is optional but worth having.
Third-party dependencies are usually under
/usr/pkg/, but if you have a custom setup, adjust the "/usr/pkg" (below) accordingly.
Clone the monero repository recursively and checkout the most recent release as described above. Then build monero:
gmake BOOST_ROOT=/usr/pkg LDFLAGS="-Wl,-R/usr/pkg/lib" release. The resulting executables can be found in
The default Solaris linker can't be used, you have to install GNU ld, then run cmake manually with the path to your copy of GNU ld:
mkdir -p build/release cd build/release cmake -DCMAKE_LINKER=/path/to/ld -D CMAKE_BUILD_TYPE=Release ../.. cd ../..
Then you can run make as usual.
Building portable statically linked binaries
By default, in either dynamically or statically linked builds, binaries target the specific host processor on which the build happens and are not portable to other processors. Portable binaries can be built using the following targets:
make release-static-linux-x86_64builds binaries on Linux on x86_64 portable across POSIX systems on x86_64 processors
make release-static-linux-i686builds binaries on Linux on x86_64 or i686 portable across POSIX systems on i686 processors
make release-static-linux-armv8builds binaries on Linux portable across POSIX systems on armv8 processors
make release-static-linux-armv7builds binaries on Linux portable across POSIX systems on armv7 processors
make release-static-linux-armv6builds binaries on Linux portable across POSIX systems on armv6 processors
make release-static-win64builds binaries on 64-bit Windows portable across 64-bit Windows systems
make release-static-win32builds binaries on 64-bit or 32-bit Windows portable across 32-bit Windows systems
You can also cross-compile static binaries on Linux for Windows and macOS with the
make depends target=x86_64-linux-gnufor 64-bit linux binaries.
make depends target=x86_64-w64-mingw32for 64-bit windows binaries.
python3 g++-mingw-w64-x86-64 wine1.6 bc
make depends target=x86_64-apple-darwin11for macOS binaries.
cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python-dev
make depends target=i686-linux-gnufor 32-bit linux binaries.
make depends target=i686-w64-mingw32for 32-bit windows binaries.
make depends target=arm-linux-gnueabihffor armv7 binaries.
make depends target=aarch64-linux-gnufor armv8 binaries.
make depends target=riscv64-linux-gnufor RISC V 64 bit binaries.
make depends target=x86_64-unknown-freebsdfor freebsd binaries.
make depends target=arm-linux-androidfor 32bit android binaries
make depends target=aarch64-linux-androidfor 64bit android binaries
The required packages are the names for each toolchain on apt. Depending on your distro, they may have different names.
depends might also be easier to compile Monero on Windows than using MSYS. Activate Windows Subsystem for Linux (WSL) with a distro (for example Ubuntu), install the apt build-essentials and follow the
depends steps as depicted above.
The produced binaries still link libc dynamically. If the binary is compiled on a current distribution, it might not run on an older distribution with an older installation of libc. Passing
-DBACKCOMPAT=ON to cmake will make sure that the binary will run on systems having at least libc version 2.17.
Installing Monero from a package
DISCLAIMER: These packages are not part of this repository or maintained by this project's contributors, and as such, do not go through the same review process to ensure their trustworthiness and security.
Packages are available for
Debian Bullseye and Sid
sudo apt install monero
More info and versions in the Debian package tracker.
Arch Linux (via Community packages):
xbps-install -S monero
guix package -i monero
Gentoo Monero overlay
emerge --noreplace eselect-repository eselect repository enable monero emaint sync -r monero echo '*/*::monero ~amd64' >> /etc/portage/package.accept_keywords emerge net-p2p/monero
brew install monero
# Build using all available cores docker build -t monero . # or build using a specific number of cores (reduce RAM requirement) docker build --build-arg NPROC=1 -t monero . # either run in foreground docker run -it -v /monero/chain:/root/.bitmonero -v /monero/wallet:/wallet -p 18080:18080 monero # or in background docker run -it -d -v /monero/chain:/root/.bitmonero -v /monero/wallet:/wallet -p 18080:18080 monero
The build needs 3 GB space.
Wait one hour or more
Packaging for your favorite distribution would be a welcome contribution!
The build places the binary in
bin/ sub-directory within the build directory
from which cmake was invoked (repository root by default). To run in the
To list all available options, run
./bin/monerod --help. Options can be
specified either on the command line or in a configuration file passed by the
--config-file argument. To specify an option in the configuration file, add
a line with the syntax
argumentname is the name
of the argument without the leading dashes, for example,
To run in background:
./bin/monerod --log-file monerod.log --detach
To run as a systemd service, copy
/etc/. The example
service assumes that the user
and its home is the data directory specified in the example
If you're on Mac, you may need to add the
--max-concurrency 1 option to
monero-wallet-cli, and possibly monerod, if you get crashes refreshing.
There is a new, still experimental, integration with Tor. The feature allows connecting over IPv4 and Tor simultaneously - IPv4 is used for relaying blocks and relaying transactions received by peers whereas Tor is used solely for relaying transactions received over local RPC. This provides privacy and better protection against surrounding node (sybil) attacks.
While Monero isn't made to integrate with Tor, it can be used wrapped with torsocks, by setting the following configuration parameters and environment variables:
--p2p-bind-ip 127.0.0.1on the command line or
p2p-bind-ip=127.0.0.1in monerod.conf to disable listening for connections on external interfaces.
--no-igdon the command line or
no-igd=1in monerod.conf to disable IGD (UPnP port forwarding negotiation), which is pointless with Tor.
DNS_PUBLIC=tcp://x.x.x.xwhere x.x.x.x is the IP of the desired DNS server, for DNS requests to go over TCP, so that they are routed through Tor. When IP is not specified, monerod uses the default list of servers defined in src/common/dns_utils.cpp.
TORSOCKS_ALLOW_INBOUND=1to tell torsocks to allow monerod to bind to interfaces to accept connections from the wallet. On some Linux systems, torsocks allows binding to localhost by default, so setting this variable is only necessary to allow binding to local LAN/VPN interfaces to allow wallets to connect from remote hosts. On other systems, it may be needed for local wallets as well.
- Do NOT pass
--detachwhen running through torsocks with systemd, (see utils/systemd/monerod.service for details).
- If you use the wallet with a Tor daemon via the loopback IP (eg, 127.0.0.1:9050),
--untrusted-daemonunless it is your own hidden service.
Example command line to start monerod through Tor:
DNS_PUBLIC=tcp torsocks monerod --p2p-bind-ip 127.0.0.1 --no-igd
A helper script is in contrib/tor/monero-over-tor.sh. It assumes Tor is installed already, and runs Tor and Monero with the right configuration.
Using Tor on Tails
TAILS ships with a very restrictive set of firewall rules. Therefore, you need to add a rule to allow this connection too, in addition to telling torsocks to allow inbound connections. Full example:
sudo iptables -I OUTPUT 2 -p tcp -d 127.0.0.1 -m tcp --dport 18081 -j ACCEPT DNS_PUBLIC=tcp torsocks ./monerod --p2p-bind-ip 127.0.0.1 --no-igd --rpc-bind-ip 127.0.0.1 \ --data-dir /home/amnesia/Persistent/your/directory/to/the/blockchain
As of May 2020, the full Monero blockchain file is about 100 GB. One can store a pruned blockchain, which is about 30 GB.
A pruned blockchain can only serve part of the historical chain data to other peers, but is otherwise identical in
functionality to the full blockchain.
To use a pruned blockchain, it is best to start the initial sync with
--prune-blockchain. However, it is also possible
to prune an existing blockchain using the
monero-blockchain-prune tool or using the
with an existing chain. If an existing chain exists, pruning will temporarily require disk space to store both the full
and pruned blockchains.
For more detailed information see the 'Pruning' entry in the Moneropedia
This section contains general instructions for debugging failed installs or problems encountered with Monero. First, ensure you are running the latest version built from the Github repo.
Obtaining stack traces and core dumps on Unix systems
We generally use the tool
gdb (GNU debugger) to provide stack trace functionality, and
ulimit to provide core dumps in builds which crash or segfault.
- To use
gdbin order to obtain a stack trace for a build that has stalled:
Run the build.
Once it stalls, enter the following command:
gdb /path/to/monerod `pidof monerod`
thread apply all bt within gdb in order to obtain the stack trace
- If however the core dumps or segfaults:
ulimit -c unlimited on the command line to enable unlimited filesizes for core dumps
echo core | sudo tee /proc/sys/kernel/core_pattern to stop cores from being hijacked by other tools
Run the build.
When it terminates with an output along the lines of "Segmentation fault (core dumped)", there should be a core dump file in the same directory as monerod. It may be named just
core.xxxx with numbers appended.
You can now analyse this core dump with
gdb as follows:
gdb /path/to/monerod /path/to/dumpfile`
Print the stack trace with
- If a program crashed and cores are managed by systemd, the following can also get a stack trace for that crash:
coredumpctl -1 gdb
To run Monero within gdb:
Pass command-line options with
--args followed by the relevant arguments
run to run monerod
Analysing memory corruption
There are two tools available:
Configure Monero with the -D SANITIZE=ON cmake flag, eg:
cd build/debug && cmake -D SANITIZE=ON -D CMAKE_BUILD_TYPE=Debug ../..
You can then run the monero tools normally. Performance will typically halve.
Install valgrind and run as
valgrind /path/to/monerod. It will be very slow.
Instructions for debugging suspected blockchain corruption as per @HYC
There is an
mdb_stat command in the LMDB source that can print statistics about the database but it's not routinely built. This can be built with the following command:
cd ~/monero/external/db_drivers/liblmdb && make
The output of
mdb_stat -ea <path to blockchain dir> will indicate inconsistencies in the blocks, block_heights and block_info table.
The output of
mdb_dump -s blocks <path to blockchain dir> and
mdb_dump -s block_info <path to blockchain dir> is useful for indicating whether blocks and block_info contain the same keys.
These records are dumped as hex data, where the first line is the key and the second line is the data.
Because of the nature of the socket-based protocols that drive monero, certain protocol weaknesses are somewhat unavoidable at this time. While these weaknesses can theoretically be fully mitigated, the effort required (the means) may not justify the ends. As such, please consider taking the following precautions if you are a monero node operator:
monerodon a "secured" machine. If operational security is not your forte, at a very minimum, have a dedicated a computer running
monerodand do not browse the web, use email clients, or use any other potentially harmful apps on your
monerodmachine. Do not click links or load URL/MUA content on the same machine. Doing so may potentially exploit weaknesses in commands which accept "localhost" and "127.0.0.1".
- If you plan on hosting a public "remote" node, start
--restricted-rpc. This is a must.
Certain blockchain "features" can be considered "bugs" if misused correctly. Consequently, please consider the following:
- When receiving monero, be aware that it may be locked for an arbitrary time if the sender elected to, preventing you from spending that monero until the lock time expires. You may want to hold off acting upon such a transaction until the unlock time lapses. To get a sense of that time, you can consider the remaining blocktime until unlock as seen in the